saveImage() GIF option

daniele-colombo

hi guys,
does anybody know how 'imageGIFRGBColorTable' works?
i mean, which ones are the possible arguments? i would need an example to see.
ex.:

saveImage(img_folder+name+extension, imageGIFRGBColorTable=???)

(I tried =24, ="24-bit" …i know, stupid trials)

thanks a lot

frederik

I'm not a color or gif expert. But this works:

# see http://www.cocoabuilder.com/archive/cocoa/104713-nsimagergbcolortable-crash.html
newPage(100, 100)

linearGradient(
            (0, 0),                         # startPoint
            (100, 100),                         # endPoint
            [(1, 0, 0), (0, 0, 1), (0, 1, 0)],  # colors
            [0, .2, 1]                          # locations
            )
rect(0, 0, 100, 100)
    
fill(1, 0, 0)
rect(20, 20, 20, 20)

fill(0, 1, 0)
rect(100-40, 20, 20, 20)

fill(0, 0, 1)
rect(100-40, 100-40, 20, 20)

fill(0, 1, 1)
rect(20, 100-40, 20, 20)


import struct

table = b""

for i in range(256):
    r = struct.pack(">B", 30)
    g = struct.pack(">B", i)
    b = struct.pack(">B", 255)
    #a = struct.pack(">B", 254) # use if imageGIFDitherTransparency is True 
    table += r + g + b # + a

# table must have a size of 768 
# or 1024 when imageGIFDitherTransparency is True
print(len(table))

test = '~/Desktop/testGif.gif'
saveImage(test, imageGIFRGBColorTable=table)

newPage(100, 100)
image(test, (0, 0))