[PD] [pix_data] - convert rgb values to pd canvas format

[João Pais]

Ok. Do you know what should be done to convert to Pd's rgb format?

> I'm pretty sure the 4th value is alpha
>
> Sent from my iPhone
>
>> On Dec 31, 2015, at 7:53 AM, João Pais <jmmmpais at gmail.com> wrote:
>>
>> Hello list,
>>
>> I'm trying to use [pix_data] to get the RGB values from an image, and  
>> color a canvas using them. But the results come out a bit weird, as not  
>> all colors match.
>>
>> I can try to some a more detailed patch in a couple of days, but wanted  
>> to ask first the there is any example of how to use the values coming  
>> out of [pix_data]:
>> - should the gray value be used?
>> - the middle outlet should send a list of RGB values, but I noticed  
>> that instead a list of 4 values comes out. This isn't documented, what  
>> is the 4th value?
>>
>> Attached are 2 pictures that should exemplifiy the issue:
>> - rgb.tif - a rgb palette
>> - rgb-conv.tif - the result after my interpretation of the data
>>
>> Best,
>>
>> Joao
>> <rgb.tif>
>> <rgb-conv.tif>
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