PIL does not allow resizing default bitmap font. This code resizes it by itself.
The disadvantage is slow speed but the advantage is it becomes possible to set color of each pixel of text foreground and background.
As an example I set foreground to reverse colors and background to grayscale.
Python, 50 lines
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Copy to clipboard1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 | # Draw (Bitmap Font) Text to Image
from PIL import Image, ImageDraw, ImageFont
def reverseColor(r, g, b):
return (255 - r, 255 - g, 255 - b)
def grayscaleColor(r, g, b):
a = (r + g + b) / 3
return (a, a, a)
text = "Hello World!"
# textColor = (255, 255, 0) # RGB Yellow
# textBackgroundColor = (255, 0, 0) # RGB Red
textX = 400 # text width in pixels
textY = 100 # text height in pixels
textTopLeftX = 0
textTopLeftY = 0
# create new image
# imgx = 800 # image width in pixels
# imgy = 600 # image height in pixels
# image = Image.new("RGB", (imgx, imgy))
# load image
image = Image.open("input.png")
(imgx, imgy) = image.size
# image = image.resize((imgx, imgy), Image.BICUBIC)
font = ImageFont.load_default() # load default bitmap font
(width, height) = font.getsize(text)
textImage = font.getmask(text)
pixels = image.load()
for y in range(imgy):
by = int(height * (y - textTopLeftY) / textY + 0.5)
if by >= 0 and by < height:
for x in range(imgx):
bx = int(width * (x - textTopLeftX) / textX + 0.5)
if bx >= 0 and bx < width:
if textImage.getpixel((bx, by)) == 0: # text background
# pass # transparent background
# pixels[x, y] = textBackgroundColor
# (r, g, b, a) = pixels[x, y]
(r, g, b) = pixels[x, y]
pixels[x, y] = grayscaleColor(r, g, b)
else: # text foreground
# pixels[x, y] = textColor
# (r, g, b, a) = pixels[x, y]
(r, g, b) = pixels[x, y]
pixels[x, y] = reverseColor(r, g, b)
image.save("output.png", "PNG")
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Don't know, if that is a error, but changing: (r, g, b, a) = pixels[x, y] to (r, g, b) = pixels[x, y]
it will work. With four parameters it end with error: ValueError: need more than 3 values to unpack
Fixed. I didn't notice that problem when I had posted this code. Maybe my test image had rgba values instead of rgb.