Center-/middle-align text with PIL? - python

How would I center-align (and middle-vertical-align) text when using PIL?

Deprecation Warning: textsize is deprecated and will be removed in Pillow 10 (2023-07-01). Use textbbox or textlength instead.
Code using textbbox instead of textsize.
from PIL import Image, ImageDraw, ImageFont
def create_image(size, bgColor, message, font, fontColor):
W, H = size
image = Image.new('RGB', size, bgColor)
draw = ImageDraw.Draw(image)
_, _, w, h = draw.textbbox((0, 0), message, font=font)
draw.text(((W-w)/2, (H-h)/2), message, font=font, fill=fontColor)
return image
myFont = ImageFont.truetype('Roboto-Regular.ttf', 16)
myMessage = 'Hello World'
myImage = create_image((300, 200), 'yellow', myMessage, myFont, 'black')
myImage.save('hello_world.png', "PNG")
Result
Use Draw.textsize method to calculate text size and re-calculate position accordingly.
Here is an example:
from PIL import Image, ImageDraw
W, H = (300,200)
msg = "hello"
im = Image.new("RGBA",(W,H),"yellow")
draw = ImageDraw.Draw(im)
w, h = draw.textsize(msg)
draw.text(((W-w)/2,(H-h)/2), msg, fill="black")
im.save("hello.png", "PNG")
and the result:
If your fontsize is different, include the font like this:
myFont = ImageFont.truetype("my-font.ttf", 16)
draw.textsize(msg, font=myFont)

Here is some example code which uses textwrap to split a long line into pieces, and then uses the textsize method to compute the positions.
from PIL import Image, ImageDraw, ImageFont
import textwrap
astr = '''The rain in Spain falls mainly on the plains.'''
para = textwrap.wrap(astr, width=15)
MAX_W, MAX_H = 200, 200
im = Image.new('RGB', (MAX_W, MAX_H), (0, 0, 0, 0))
draw = ImageDraw.Draw(im)
font = ImageFont.truetype(
'/usr/share/fonts/truetype/msttcorefonts/Arial.ttf', 18)
current_h, pad = 50, 10
for line in para:
w, h = draw.textsize(line, font=font)
draw.text(((MAX_W - w) / 2, current_h), line, font=font)
current_h += h + pad
im.save('test.png')

One shall note that the Draw.textsize method is inaccurate. I was working with low pixels images, and after some testing, it turned out that textsize considers every character to be 6 pixel wide, whereas an I takes max. 2 pixels and a W takes min. 8 pixels (in my case). And so, depending on my text, it was or wasn't centered at all. Though, I guess "6" was an average, so if you're working with long texts and big images, it should still be ok.
But now, if you want some real accuracy, you better use the getsize method of the font object you're going to use:
arial = ImageFont.truetype("arial.ttf", 9)
w,h = arial.getsize(msg)
draw.text(((W-w)/2,(H-h)/2), msg, font=arial, fill="black")
As used in Edilio's link.

A simple solution if you're using PIL 8.0.0 or above: text anchors
width, height = # image width and height
draw = ImageDraw.draw(my_image)
draw.text((width/2, height/2), "my text", font=my_font, anchor="mm")
mm means to use the middle of the text as anchor, both horizontally and vertically.
See the anchors page for other kinds of anchoring. For example if you only want to center horizontally you may want to use ma.

The PIL docs for ImageDraw.text are a good place to start, but don't answer your question.
Below is an example of how to center the text in an arbitrary bounding box, as opposed to the center of an image. The bounding box is defined as: (x1, y1) = upper left corner and (x2, y2) = lower right corner.
from PIL import Image, ImageDraw, ImageFont
# Create blank rectangle to write on
image = Image.new('RGB', (300, 300), (63, 63, 63, 0))
draw = ImageDraw.Draw(image)
message = 'Stuck in\nthe middle\nwith you'
bounding_box = [20, 30, 110, 160]
x1, y1, x2, y2 = bounding_box # For easy reading
font = ImageFont.truetype('Consolas.ttf', size=12)
# Calculate the width and height of the text to be drawn, given font size
w, h = draw.textsize(message, font=font)
# Calculate the mid points and offset by the upper left corner of the bounding box
x = (x2 - x1 - w)/2 + x1
y = (y2 - y1 - h)/2 + y1
# Write the text to the image, where (x,y) is the top left corner of the text
draw.text((x, y), message, align='center', font=font)
# Draw the bounding box to show that this works
draw.rectangle([x1, y1, x2, y2])
image.show()
image.save('text_center_multiline.png')
The output shows the text centered vertically and horizontally in the bounding box.
Whether you have a single or multiline message no longer matters, as PIL incorporated the align='center' parameter. However, it is for multiline text only. If the message is a single line, it needs to be manually centered. If the message is multiline, align='center' does the work for you on subsequent lines, but you still have to manually center the text block. Both of these cases are solved at once in the code above.

Use the textsize method (see docs) to figure out the dimensions of your text object before actually drawing it. Then draw it starting at the appropriate coordinates.

All the other answers did NOT take text ascender into consideration.
Here's a backport of ImageDraw.text(..., anchor="mm"). Not sure if it's fully compatible with anchor="mm", cause I haven't tested the other kwargs like spacing, stroke_width yet. But I ensure you this offset fix works for me.
from PIL import ImageDraw
from PIL import __version__ as pil_ver
PILLOW_VERSION = tuple([int(_) for _ in pil_ver.split(".")[:3]])
def draw_anchor_mm_text(
im,
xy,
# args shared by ImageDraw.textsize() and .text()
text,
font=None,
spacing=4,
direction=None,
features=None,
language=None,
stroke_width=0,
# ImageDraw.text() exclusive args
**kwargs,
):
"""
Draw center middle-aligned text. Basically a backport of
ImageDraw.text(..., anchor="mm").
:param PIL.Image.Image im:
:param tuple xy: center of text
:param unicode text:
...
"""
draw = ImageDraw.Draw(im)
# Text anchor is firstly implemented in Pillow 8.0.0.
if PILLOW_VERSION >= (8, 0, 0):
kwargs.update(anchor="mm")
else:
kwargs.pop("anchor", None) # let it defaults to "la"
if font is None:
font = draw.getfont()
# anchor="mm" middle-middle coord xy -> "left-ascender" coord x'y'
# offset_y = ascender - top, https://stackoverflow.com/a/46220683/5101148
# WARN: ImageDraw.textsize() return text size with offset considered.
w, h = draw.textsize(
text,
font=font,
spacing=spacing,
direction=direction,
features=features,
language=language,
stroke_width=stroke_width,
)
offset = font.getoffset(text)
w, h = w - offset[0], h - offset[1]
xy = (xy[0] - w / 2 - offset[0], xy[1] - h / 2 - offset[1])
draw.text(
xy,
text,
font=font,
spacing=spacing,
direction=direction,
features=features,
language=language,
stroke_width=stroke_width,
**kwargs,
)
Refs
https://pillow.readthedocs.io/en/stable/handbook/text-anchors.html
https://github.com/python-pillow/Pillow/issues/4789
https://stackoverflow.com/a/46220683/5101148
https://github.com/python-pillow/Pillow/issues/2486

Using a combination of anchor="mm" and align="center" works wonders. Example
draw.text(
xy=(width / 2, height / 2),
text="centered",
fill="#000000",
font=font,
anchor="mm",
align="center"
)
Note: Tested where font is an ImageFont class object constructed as such:
ImageFont.truetype('path/to/font.ttf', 32)

This is a simple example to add a text in the center of the image
from PIL import Image, ImageDraw, ImageFilter
msg = "hello"
img = Image.open('image.jpg')
W, H = img.size
box_image = img.filter(ImageFilter.BoxBlur(4))
draw = ImageDraw.Draw(box_image)
w, h = draw.textsize(msg)
draw.text(((W - w) / 2, (H - h) / 2), msg, fill="black")
box_image.show()

if you are using the default font then you can use this simple calculation
draw.text((newimage.width/2-len(text)*3, 5), text,fill="black", align ="center",anchor="mm")
the main thing is
you have to divide the image width by 2 then get the length of the string you want and multiply it by 3 and subtract it from the division result
newimage.width/2-len(text)*3 #this is X position
**this answer is an estimation for the default font size used if you use a custom font then the multiplier must be changed accordingly. in the default case it is 3

Related

How to add text to image with different angles using Python [duplicate]

This question already has answers here:
How do I draw text at an angle using python's PIL?
(7 answers)
Closed 3 days ago.
How can I add text to an image with a different angle?
It can use OpenCV, Pillow or anything.
For example, how can I print "Hello World" at 120° in an image?
You can use the Python Imaging Library (Pillow) to add text with a different angle to an image. Here's an example code snippet to print "Hello World" at 120 degrees angle in an image:
from PIL import Image, ImageDraw, ImageFont
import math
# Open the image
image = Image.open("your_image.png")
# Create a new transparent image with the same size as the original image
overlay = Image.new('RGBA', image.size, (255, 255, 255, 0))
# Get a drawing context
draw = ImageDraw.Draw(overlay)
# Set the font and text
font = ImageFont.truetype('arial.ttf', 36)
text = "Hello World"
# Calculate the position and rotation of the text
angle = 120
radians = math.radians(angle)
width, height = draw.textsize(text, font)
x = (image.width - width) / 2
y = (image.height - height) / 2
cx, cy = x + width / 2, y + height / 2
x, y = x - cx, y - cy
x, y = x * math.cos(radians) - y * math.sin(radians), x * math.sin(radians) + y * math.cos(radians)
x, y = x + cx, y + cy
# Draw the text on the transparent image
draw.text((x, y), text, font=font, fill=(255, 255, 255, 255))
# Paste the transparent image on the original image with a given alpha value
alpha = 0.5
image = Image.alpha_composite(image, overlay)
# Save the image
image.save("output.png")
In this code, we first open the original image and create a new transparent image with the same size as the original image. Then, we get a drawing context for the transparent image, set the font and text, and calculate the position and rotation of the text based on the angle. Finally, we draw the text on the transparent image, paste the transparent image on the original image with a given alpha value, and save the output image.

Python PIL text placement centering

I have a format certificate, let's assume equal to this: https://elearning.adobe.com/blank-achievement-certificate
Once downloaded the sample certificate and saved as 'certificate.png', I wrote an example code on Python of what I have to do to automate certificates production:
from PIL import Image, ImageDraw, ImageFont
people = ['Homer Simpson', 'Seymour Skinner', 'Apu Nahasapeemapetilon']
for i in range(len(people)):
img = Image.open('certificate.png')
d = ImageDraw.Draw(img)
d.text((290, 210), people[i], fill = (255, 0, 0), font = ImageFont.truetype("times.ttf", 24))
img.show()
I am looking for obtaining a way to center the text to be written along x axis direction, as certificates are not acceptable depending on the length of the name.
PIL.ImageDraw has a method to get the size of the text you're about to draw:
draw = ImageDraw.Draw(img)
w, h = draw.textsize("Your Text")
so to write something in the center you'd do the following
people = ['Homer Simpson', 'Seymour Skinner', 'Apu Nahasapeemapetilon']
for person in people:
img = Image.open('certificate.png')
# Get the size of the image
W, H = img.size
draw = ImageDraw.Draw(img)
# Get the size of the textbox
w, h = draw.textsize(person)
coords = ((W - w) / 2, (H - h) / 2)
draw.text(coords, person, fill = (255, 0, 0), font = ImageFont.truetype("times.ttf", 24))
img.show()
Also note that you can iterate directly over people, rather than iterating over range(len(people)).

Can't center characters using Pillow and Python

I am trying to write characters in specific locations in an image. I am using Pillow v6, Python 3.6.
Here is my code, I draw char by char, passing the top left point that I calculated.
font = ImageFont.truetype('platechar.tff', 500)
def draw_single_char(img, font, val, tl): #tl = (x,y)
pil_img = Image.fromarray(np.uint8(img))
draw = ImageDraw.Draw(pil_img)
draw.text(tl, val, (0,0,0), font=font)
img = np.array(pil_img)
return img
The output is not centered, I got the character width and height from the font, then with my top left point I draw the rectangle enclosing the character. The character is not centered inside the rectangle.
Font: https://drive.google.com/open?id=1N9rN-AgjK83U9ZDycLKxjeMP3o36vbfg
I want it to be like this (another font)
EDIT
Using Bidu Font editor I was able to remove the horizontal space (blue line). How can I center it vertically?.
Result so far ...
It looks like the font you are using contains non-centered numbers inside originally. So you should choose another font or you can modify your placechar.tff in a special editor for fonts.
Also you can calculate coordinate offsets for each symbol manually, store them into a dictionary and apply it for your text before drawing. It doesn't look like a good idea, but it would work also.
Calculate the width and height of the text to be drawn:
from PIL import Image, ImageDraw, ImageFont
txt='7'
font = ImageFont.truetype('platechar.ttf', 250)
(W, H) = font.getsize(txt)
image = Image.new('RGB', (256, 256), (63, 63, 63, 0))
drawer = ImageDraw.Draw(image)
(offset_w, offset_h) = font.getoffset(txt)
(x, y, W_mask, H_mask) = font.getmask(txt).getbbox()
drawer.text((10, 10 - offset_h), txt, align='center', font=font)
drawer.rectangle((10, 10, W + offset_w, 10 + H - offset_h), outline='black')
drawer.rectangle((x+10, y+10, W_mask+10, H_mask+10), outline='red')
image.show()
image.save('example.png', 'PNG')
After taking the path that #Fomalhaut suggested, using font editor. I found Bidu font editor (link in the question). I was able to fix the horizontal space (also shown in the question). For vertical space, after searching the menus, I found setting option to change the ascent.
I decreased it to 1440, and it worked.

Break long drawn text to multiple lines with Pillow

I'm creating a small python program that draws text on a small 128x48 image.
It works fine for text that only reaches width of 120, but I can't figure out how to have longer text split into an additional line. How do I go about doing so?
I've attempted using textwrap3, but I couldn't get it to work with Pillow.
The program creates 128x48 images files with a black background and yellow centered text, that is later supposed to be viewed on a device that outputs up to 480i, so simply making the text much smaller to fit additional text width won't be helpful. The font currently used is Arial 18.
Here's the current code used to create the image:
from PIL import Image, ImageDraw, ImageFont
AppName = "TextGoesHere"
Font = ImageFont.truetype('./assets/Arial.ttf', 18)
img = Image.new('RGB', (128, 48), color='black')
d = ImageDraw.Draw(img)
# Get width and height of text
w, h = d.textsize(AppName, font=Font)
# Draw text
d.text(((128-w)/2, (48-h)/2), AppName, font=Font, fill=(255, 255, 0))
img.save('icon.png')
The above code outputs the image like this:
Longer text with width bigger then the image outputs like this (LongerTextGoesHere):
The wanted result should be simular to this:
Here's some code that uses binary search with PIL/Pillow to break the text into pieces that fit.
def break_fix(text, width, font, draw):
if not text:
return
lo = 0
hi = len(text)
while lo < hi:
mid = (lo + hi + 1) // 2
t = text[:mid]
w, h = draw.textsize(t, font=font)
if w <= width:
lo = mid
else:
hi = mid - 1
t = text[:lo]
w, h = draw.textsize(t, font=font)
yield t, w, h
yield from break_fix(text[lo:], width, font, draw)
def fit_text(img, text, color, font):
width = img.size[0] - 2
draw = ImageDraw.Draw(img)
pieces = list(break_fix(text, width, font, draw))
height = sum(p[2] for p in pieces)
if height > img.size[1]:
raise ValueError("text doesn't fit")
y = (img.size[1] - height) // 2
for t, w, h in pieces:
x = (img.size[0] - w) // 2
draw.text((x, y), t, font=font, fill=color)
y += h
img = Image.new('RGB', (128, 48), color='black')
fit_text(img, 'LongerTextGoesHere', (255,255,0), Font)
img.show()
You can do that pretty simply without needing to code any Python if you use ImageMagick which is installed on most Linux distros and is available for macOS and Windows. So, just in Terminal:
convert -size 128x48 -background black -font Arial -fill yellow -gravity center caption:"Some Text" result.png
Or, with a longer text string:
convert -size 128x48 -background black -font Arial -fill yellow -gravity center caption:"Some Really Really Long Text" result.png
If you really, really want to write Python, Wand is a Python binding for ImageMagick and the function names will mirror those used above.

How do I draw text at an angle using python's PIL?

Using Python I want to be able to draw text at different angles using PIL.
For example, imagine you were drawing the number around the face of a clock. The number 3 would appear as expected whereas 12 would we drawn rotated counter-clockwise 90 degrees.
Therefore, I need to be able to draw many different strings at many different angles.
Draw text into a temporary blank image, rotate that, then paste that onto the original image. You could wrap up the steps in a function. Good luck figuring out the exact coordinates to use - my cold-fogged brain isn't up to it right now.
This demo writes yellow text on a slant over an image:
# Demo to add rotated text to an image using PIL
import Image
import ImageFont, ImageDraw, ImageOps
im=Image.open("stormy100.jpg")
f = ImageFont.load_default()
txt=Image.new('L', (500,50))
d = ImageDraw.Draw(txt)
d.text( (0, 0), "Someplace Near Boulder", font=f, fill=255)
w=txt.rotate(17.5, expand=1)
im.paste( ImageOps.colorize(w, (0,0,0), (255,255,84)), (242,60), w)
It's also usefull to know our text's size in pixels before we create an Image object. I used such code when drawing graphs. Then I got no problems e.g. with alignment of data labels (the image is exactly as big as the text).
(...)
img_main = Image.new("RGB", (200, 200))
font = ImageFont.load_default()
# Text to be rotated...
rotate_text = u'This text should be rotated.'
# Image for text to be rotated
img_txt = Image.new('L', font.getsize(rotate_text))
draw_txt = ImageDraw.Draw(img_txt)
draw_txt.text((0,0), rotate_text, font=font, fill=255)
t = img_value_axis.rotate(90, expand=1)
The rest of joining the two images together is already described on this page.
When you rotate by an "unregular" angle, you have to improve this code a little bit. It actually works for 90, 180, 270...
Here is a working version, inspired by the answer, but it works without opening or saving images.
The two images have colored background and alpha channel different from zero to show what's going on. Changing the two alpha channels from 92 to 0 will make them completely transparent.
from PIL import Image, ImageFont, ImageDraw
text = 'TEST'
font = ImageFont.truetype(r'C:\Windows\Fonts\Arial.ttf', 50)
width, height = font.getsize(text)
image1 = Image.new('RGBA', (200, 150), (0, 128, 0, 92))
draw1 = ImageDraw.Draw(image1)
draw1.text((0, 0), text=text, font=font, fill=(255, 128, 0))
image2 = Image.new('RGBA', (width, height), (0, 0, 128, 92))
draw2 = ImageDraw.Draw(image2)
draw2.text((0, 0), text=text, font=font, fill=(0, 255, 128))
image2 = image2.rotate(30, expand=1)
px, py = 10, 10
sx, sy = image2.size
image1.paste(image2, (px, py, px + sx, py + sy), image2)
image1.show()
The previous answers draw into a new image, rotate it, and draw it back into the source image. This leaves text artifacts. We don't want that.
Here is a version that instead crops the area of the source image that will be drawn onto, rotates it, draws into that, and rotates it back. This means that we draw onto the final surface immediately, without having to resort to masks.
def draw_text_90_into (text: str, into, at):
# Measure the text area
font = ImageFont.truetype (r'C:\Windows\Fonts\Arial.ttf', 16)
wi, hi = font.getsize (text)
# Copy the relevant area from the source image
img = into.crop ((at[0], at[1], at[0] + hi, at[1] + wi))
# Rotate it backwards
img = img.rotate (270, expand = 1)
# Print into the rotated area
d = ImageDraw.Draw (img)
d.text ((0, 0), text, font = font, fill = (0, 0, 0))
# Rotate it forward again
img = img.rotate (90, expand = 1)
# Insert it back into the source image
# Note that we don't need a mask
into.paste (img, at)
Supporting other angles, colors etc is trivial to add.
Here's a fuller example of watermarking diagonally. Handles arbitrary image ratios, sizes and text lengths by calculating the angle of the diagonal and font size.
from PIL import Image, ImageFont, ImageDraw
import math
# sample dimensions
pdf_width = 1000
pdf_height = 1500
#text_to_be_rotated = 'Harry Moreno'
text_to_be_rotated = 'Harry Moreno (morenoh149#gmail.com)'
message_length = len(text_to_be_rotated)
# load font (tweak ratio based on your particular font)
FONT_RATIO = 1.5
DIAGONAL_PERCENTAGE = .5
diagonal_length = int(math.sqrt((pdf_width**2) + (pdf_height**2)))
diagonal_to_use = diagonal_length * DIAGONAL_PERCENTAGE
font_size = int(diagonal_to_use / (message_length / FONT_RATIO))
font = ImageFont.truetype(r'./venv/lib/python3.7/site-packages/reportlab/fonts/Vera.ttf', font_size)
#font = ImageFont.load_default() # fallback
# target
image = Image.new('RGBA', (pdf_width, pdf_height), (0, 128, 0, 92))
# watermark
opacity = int(256 * .5)
mark_width, mark_height = font.getsize(text_to_be_rotated)
watermark = Image.new('RGBA', (mark_width, mark_height), (0, 0, 0, 0))
draw = ImageDraw.Draw(watermark)
draw.text((0, 0), text=text_to_be_rotated, font=font, fill=(0, 0, 0, opacity))
angle = math.degrees(math.atan(pdf_height/pdf_width))
watermark = watermark.rotate(angle, expand=1)
# merge
wx, wy = watermark.size
px = int((pdf_width - wx)/2)
py = int((pdf_height - wy)/2)
image.paste(watermark, (px, py, px + wx, py + wy), watermark)
image.show()
Here it is in a colab https://colab.research.google.com/drive/1ERl7PiX6xKy5H9EEMulBKPgglF6euCNA?usp=sharing you should provide an example image to the colab.
I'm not saying this is going to be easy, or that this solution will necessarily be perfect for you, but look at the documentation here:
http://effbot.org/imagingbook/pil-index.htm
and especially pay attention to the Image, ImageDraw, and ImageFont modules.
Here's an example to help you out:
import Image
im = Image.new("RGB", (100, 100))
import ImageDraw
draw = ImageDraw.Draw(im)
draw.text((50, 50), "hey")
im.rotate(45).show()
To do what you really want you may need to make a bunch of separate correctly rotated text images and then compose them all together with some more fancy manipulation. And after all that it still may not look great. I'm not sure how antialiasing and such is handled for instance, but it might not be good. Good luck, and if anyone has an easier way, I'd be interested to know as well.
If you a using aggdraw, you can use settransform() to rotate the text. It's a bit undocumented, since effbot.org is offline.
# Matrix operations
def translate(x, y):
return np.array([[1, 0, x], [0, 1, y], [0, 0, 1]])
def rotate(angle):
c, s = np.cos(angle), np.sin(angle)
return np.array([[c, -s, 0], [s, c, 0], [0, 0, 1]])
def draw_text(image, text, font, x, y, angle):
"""Draw text at x,y and rotated angle radians on the given PIL image"""
m = np.matmul(translate(x, y), rotate(angle))
transform = [m[0][0], m[0][1], m[0][2], m[1][0], m[1][1], m[1][2]]
draw = aggdraw.Draw(image)
draw.settransform(transform)
draw.text((tx, ty), text, font)
draw.settransform()
draw.flush()

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