Hi,
Thanks for so quickly answering.
Am 05.02.03, 11:21 +0100 schrieb Mart� Maria:
>
> Hi,
>
> > I wanna convert from RGB to Lab and back.
> > What goes wrong with my data?
>
> If you declare buffer as being WORD:
>
> > unsigned short InputBuffer[3];
> > unsigned short OutputBuffer[3];
>
> Then you should use TYPE_RGB_16, TYPE_Lab_16 instead.
Ok I just restart from ground. The types of the buffers should be:
unsigned char InputBuffer[3];
unsigned char OutputBuffer[3];
That works with TYPE_RGB_8 and TYPE_Lab_8.
But the results are strange.
I get following:
L 126 a 126 b 126 -> R 114 G 119 B 120
L 253 a 0 b 0 -> R 0 G 255 B 255
L 255 a 127 b 255 -> R 255 G 253 B 0
... could be ok with Lab 128,128,128 defined as neutral grey.
Now I have Tiffs from PS6 and they are lock strange:
L 213 a 255 b 247 -> R 255 G 0 B 0 light Clouds (red)
L 183 a 26 b 58 -> R 0 G 220 B 255 sand with sun (light blue)
L 112 a 44 b 49 -> R 0 G 136 B 238 sand in the shadow (blue)
Is Lab allways Lab or sometimes different?
I obtain the same with unsigned short's.
I only could imagine something like this: L = unsigned
a = signed (+/-)
b = signed (+/-)
??
Kai-Uwe
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