Beginning with Pillow, the PIL Fork (Python Imaging Library)

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4 – Reading the pixels

You can access to the individual pixels of the pixmap using the getpixel() function of the image object. In the following example, tex01 is a GLSL Hacker texture and pixels of Pillow image object are copied into tex01 using gh_texture.set_texel_2d() function.

The getpixel() function returns the value of a single pixel. Just give a tuple with the X and Y coordinates and getpixel() returns a 3-tuple RGB for a RGB image or a single value for a luminance image.

if (im != None):
  tex01 = moon3d.image.create2dRgbU8(imageW, imageH)

  if (im.mode == "RGB"):
    for y in range(0, imageH):
      for x in range(0, imageW):
        offset = y*imageW + x
        xy = (x, y)
        rgb = im.getpixel(xy)
        gh_texture.set_texel_2d(tex01, x, y, rgb[0], rgb[1], rgb[2], 255) 
        
  elif (imout.mode == "L"):
    for y in range(0, imageH):
      for x in range(0, imageW):
        offset = y*imageW + x
        xy = (x, y)
        r = im.getpixel(xy)
        gh_texture.set_texel_2d(tex01, x, y, r, r, r, 255) 
else:
  tex01 = moon3d.image.load2d(img_filename)



The full demo is available in moon3d/gl-210-python-pil-pillow/pillow_pixmap_reading_pixels.xml. Just load it in GLSL Hacker and you should have:

GLSL Hacker, Pillow (PIL fork) pixmap reading, Python





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