[magick-users] How to convert colorspace from "YUV" to "RGBA"?

[Zhaoyang Guo]

Hello everyone,

I'm writing to check whether the commands, whick convert a jpeg "444" 
picture to "RGB", "420" and "422" formats, are correct.

#from YUV colorspace to RGB colorspace
convert -colorspace RGB Pic_444.jpg Pic_RGB.jpg

convert -sampling-factor 2x1,1x1,1x1  Pic_444.jpg Pic_422.jpg

convert -sampling-factor 2x2,1x1,1x1  Pic_444.jpg Pic_420.jpg



Thank you for your help.

Zhaoyang GUO

-- 
Sigma Designs Europe

4, rue Ferrus
75014 Paris, France


>
> Fred Weinhaus wrote:
>> In principle, just
>>
>> convert image.jpg -channel rgba -alpha on -colorspace yuv output.png
>>
>> you need png or gif for output or some format 
>> that will save alpha channel. But as jpg does not 
>> support alpha channel, you will just get an 
>> opaque image as the result anyway.
>>
>>
>> see
>> http://www.imagemagick.org/script/command-line-options.php#colorspace
>> http://www.imagemagick.org/script/command-line-options.php#alpha
>> http://www.imagemagick.org/script/command-line-options.php#channel
>> http://www.imagemagick.org/Usage/basics/#alpha
>> http://www.imagemagick.org/Usage/channels/
>>
>>
>>
>>   
>>> Dear expertsÅC
>>>
>>> I'm writing to ask how to convert *.jpg picture from YUV colorspace to
>>> RGBA colorspace?
>>>
>>> Thank you for your help.
>>>
>>> Zhaoyang GUO
>>>
>>> --
>>> Sigma Designs Europe
>>>
>>> 4, rue Ferrus
>>> 75014 Paris, France
>>>     
>> _______________________________________________
>> Magick-users mailing list
>> Magick-users at imagemagick.org
>> http://studio.imagemagick.org/mailman/listinfo/magick-users
>>   
>
>


-- 
Sigma Designs Europe

4, rue Ferrus
75014 Paris, France