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How to display and write 4 component jpeg to 3 component bmp

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amith

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Hi All,
I have a 4 component jpeg image , if it is a 4 component i should assume it
a cmyk image or in any other format ,after decoding four component jpeg image how do i display it, to write in to bmp/png/ it requireis only 3 components (RGB).how do i do that .

amith
 

Re: jpeg

hey,
you have C,M,Y,K conversion methods, i hope this will work out.

C' = (C*(1-K)+K) R = (1 - C') * range
M' = (M*(1-K)+K) G = (1 - M') * range
Y' = (Y*(1-K)+K) B = (1 - Y') * range

The range is the difference between the minimum and the maximum value of R or G or B. usually it will be 255

with regards,
sathish kumar
 

Re: jpeg

Hi satish ,
Thanks for your reply , thing is that in my test image there four componets , but there is no adobe marker present in it ,i read in net that the cmyk images consist of adobe marker , is my understanding is correct , in this cas how i can i procedure with that jpeg image .

amith
 

Re: jpeg

hi amith,
All CMYK JPEG from adobe contains the adobe marker which means that, the image is inverted what you need to do is just invert i.e, 255-x. What you need to do is, if the adobe marker is present do the inverting operation on your own if not just do the convertion. I don't have experiance on it, you just try.

with regards
sathish kumar
 

Re: jpeg

good,i have the same problem
 

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