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YUV graphics file format

Posted on 1998-12-23
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Last Modified: 2010-04-04
This may be a odd question, but how do I convert a yuv file to something usefull like a jpeg of tiff? their are two variants of yuv, and diffrent samplings, 4:2:2 interlaced. the images are 720 wide by 576 heigh with a matt.  Where do I start as I'm no expert?
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Question by:iqofone
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by:iqofone
ID: 1352724
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ZifNab earned 300 total points
ID: 1352725
Hi iqofone,

 Here some advice. First you need to know how both file types look like.
 Therefore you go to : http://www.wotsit.org/

 Then you search if somebody already looked at it.
 Therefore you go to (for yuv):  http://www.webartz.com/fourcc/indexyuv.htm
 --> you get the algorithmen for transfering YUV to RGB / RGB to YUV

RGB to YUV Conversion

Y  =  (0.257 * R) + (0.504 * G) + (0.098 * B) + 16
Cr =  (0.439 * R) - (0.368 * G) - (0.071 * B) + 128
Cb = -(0.148 * R) - (0.291 * G) + (0.439 * B) + 128

YUV to RGB Conversion

B = 1.164(Y - 16)                   + 2.018(Cb - 128)
G = 1.164(Y - 16) - 0.813(Cr - 128) - 0.391(Cb - 128)
R = 1.164(Y - 16) + 1.596(Cr - 128)

Then you make it possible to translate it from one type to the other, in Delphi.

For this you can search for freeware components with source which to such things.

Look at http://www.torry.ru for example.

And then, after hard work... you got what you want and can refine it.

Hope this helps you a little bit further.

Regards, Zif.

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Expert Comment

by:ptiemann2
ID: 1352726
I need to know the exact file format of your YUV file.
I have written converters for about 15 image file formats with various sub-formats each, so I am very sure I can help you.
Email me a sample YUV file to peter@preview.org or let me know which application created it.
Also, when you send me a file, tell me the characteristics = width, height, color depth, maybe: alpha channel/ transparency.

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Expert Comment

by:ZifNab
ID: 1352727
Hi ptiemann2, the links above bring you to the YUV formats. (I believe there are several). Zif.
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Expert Comment

by:ptiemann2
ID: 1352728
(to ZifNab)
I thought he had a non-standard format. It could be some special hardware that creates a proprietary file.
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Expert Comment

by:ZifNab
ID: 1352729
ptiemann2, yes it could be... but he never replied... hope he does now.
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