# 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")
Diff to Previous Revision
--- revision 1 2015-01-25 09:05:15
+++ revision 2 2015-07-13 18:04:30
@@ -38,11 +38,13 @@
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, 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, a) = pixels[x, y]
+ (r, g, b) = pixels[x, y]
pixels[x, y] = reverseColor(r, g, b)
image.save("output.png", "PNG")
