After taking a break for a while and coming back I found it.
put ((yy - 1) * W ) + ((xx - 1) * 4) into myindex needs to be
put ((yy - 1) * W * 4 ) + ((xx - 1) * 4) into myindex
On 2012-01-09, at 4:54 PM, Michael Doub wrote:
> getitback needs to be passed W not L (width not the length) but the problem
> still exists.
>
> On 2012-01-09, at 4:33 PM, Michael Doub wrote:
>
>> I have been trying to figure out why I have not been able to retrieve valid
>> RGB values from an image.
>> I decided to generate my own image so I would be able to track down my
>> issue. I thought that would
>> be straight forward, Several hrs later and i am still at an impasse. I
>> am trying to understand why I
>> the pixel data, that was just written seems to be corrupted. This occurs on
>> the first pixel of the second row
>> of pixels.
>>
>> Could someone take a look and point out where I am going wrong?
>> Interestingly enough, if you comment
>> out the check with the breakpoint you will get to see the image that seems
>> to look just fine.
>>
>> Thanks
>> Mike
>>
>>
>>
>> local tData
>>
>> on mouseUp
>> BuildImage
>> end mouseUp
>>
>> On BuildImage
>> put empty into tData
>> put 320 into W
>> put 426 into L
>> create image
>> put it into tID
>> set the width of tID to W
>> set the height of tID to L
>> put 1 into R
>> put 1 into G
>> put 0 into B
>> repeat with y = 1 to L
>> repeat with x =1 to W
>> put binaryEncode("CCCC",0,R,G,B) into Pixel
>> put Pixel after tData
>> get getitback (L, x, y)
>> if it <> Pixel then
>> breakpoint
>> end if
>> add 1 to R
>> if R = 256 then put 1 into R
>> end repeat
>> Add 1 to G
>> put 1 into R
>> if G = 256 then put 1 into G
>> end repeat
>> set the imageData of tID to tData
>> end BuildImage
>>
>> function getitback W, xx, yy
>> put ((yy - 1) * W ) + ((xx - 1) * 4) into myindex
>> put charToNum(char myindex + 2 of tData) into RR
>> put charToNum(char myindex + 3 of tData) into GG
>> put charToNum(char myindex + 4 of tData) into BB
>> put binaryEncode("CCCC",0,RR,GG,BB) into it
>> return it
>> end getitback
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>
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