Question

what I need:
– there are two images: a background (large) and a proifile pic (smaller)
– on background there is an oblique box, where I want to merge the profile pic

Code:

# open the profile pic
im = PIL.Image.open(pic)
# resize it to dim of oblique box
im = im.resize((picX, picY))

# this is the degree of oblique box
degree = 13.67

# open the background
bg = PIL.Image.open(bgsrc)
bgosize = bg.size
bginfo = bg.info


# first, I rotate the background to be paralell with profile pic
bg = bg.rotate(-degree, resample = PIL.Image.BILINEAR, expand = True)

# paste the profile pic to background
bg.paste(im, (px1, py1, px2, py2))

# rotate back to original orientation
bg = bg.rotate(degree, resample = PIL.Image.BILINEAR, expand = False)


# crop the rotated image, because it's greater than original size,
# after first rotate - coords are stored
bg.crop(bgx1, bgy1, bgx2, bgy2)

PIL.ImageFile.MAXBLOCK = bg.size[0] * bg.size[1]
bg.save(dst, quality = 250, optimize = True, **bginfo)

After this transform the result image is nubbly a litlebit…

How can I get a good qualtiy image?

Thanks:

a.

Answer 1

Hint 1: Use Image.BICUBIC instead of Image.BILINEAR. Unfortunately rotate does not accept Image.ANTIALIAS which would provide an even better result.

Hint 2: Instead of rotating the background and rotating it back later, rotate the image you want to paste.

Hint 3: Create an image in 'L' format that is pure white and the same size as the image you’re pasting. Rotate it the same way. Use it as a mask argument to paste.

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I haven’t tested this code but it should work. One question though, what is quality = 250 supposed to accomplish? The JPEG options for example only accept values from 1 to 95.

# open the profile pic 
im = PIL.Image.open(pic) 
# resize it to dim of oblique box 
im = im.resize((picX, picY), PIL.Image.ANTIALIAS) 

# this is the degree of oblique box 
degree = 13.67 

# open the background 
bg = PIL.Image.open(bgsrc) 
bgosize = bg.size 
bginfo = bg.info 

# create a copy of the profile that is all white
mask = PIL.Image.new('L', im.size, 0xff)

# rotate the profile and the mask
im = im.rotate(degree, resample = PIL.Image.BICUBIC, expand = True)
mask = mask.rotate(degree, resample = PIL.Image.BICUBIC, expand = True)

# paste the profile pic to background 
bg.paste(im, (px1, py1, px2, py2), mask) 

PIL.ImageFile.MAXBLOCK = bg.size[0] * bg.size[1] 
bg.save(dst, quality = 250, optimize = True, **bginfo)