[PD] Reading a specific image from [pix_buffer] and saving it using [pix_write]

Seiichiro MATSUMURA sei at low-tech-ism.com
Fri Jul 13 20:38:19 CEST 2012

Thanks Charles.

As you mentioned, YUV consists Y for Luma, U and V for the color
difference of from Luma to Blue and Red(chrominance), basically
describes colors based on brightness.
I could realize  with Wikipedia.
It also seems "1 value for 2 pixels" makes sense for weird saved jpeg file.

For converting YUV to RGB, the formula is necessary.

So, I would like to know whether YUV data in buffer are automatically
recognized and converted to RGB data with this formula for saving a
jpeg file when "save" command to [pix_buffer] works. Otherwise, do we
have to use [pix_rgba] before putting data in [pix_buffer]?



2012/7/10 Charles Goyard <cg at fsck.fr>:
> Seiichiro MATSUMURA wrote:
>> Somehow colors are changed, the width become half and a picture itself
>> is doubled.
> iirc, in YUV you have a luminance layer (Y) and then the colors encoded
> in a strange way, like 1 value for 2 pixels for the width in the U and V
> layers. Well, something like that. Maybe it's a bug in the colorspace
> conversion because you don't make it explicit ?
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Seiichiro Matsumura

sei at low-tech-ism.com

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