Starting at square one with image processing
JimAultWins at yahoo.com
Fri Jul 6 20:23:54 EDT 2007
Chipp has done some very good imagedata and alphadata example stacks.
You should see how he does:
and Wilhelm Sanke
On 7/6/07 4:51 PM, "James Hurley" <jhurley0305 at sbcglobal.net> wrote:
> I've discovered that I have no idea what's going on with the
> imagedata function.
> I thought that the imagedata was a pixel by pixel map of the image. I
> tried the following handler to look at each pixel of my image:
> on mouseUp
> put the name of image id 1014 into tName
> put the imagedata of tName into tData
> set the savedImageData of tName to tData
> --put the imagedata of img "basic.png" into tData
> put 0 into tCounter
> repeat for each char tChar in tData
> put charToNum(tChar) into tNum
> if tCounter mod 4 is 0 then put cr after results
> put tNum&comma after results
> add 1 to tCounter
> end repeat
> put results into field 1
> end mouseUp
> And I got the following in field 1:
> This was the imagedata of a short red line segment painted with the
> red pencil.
> I thought each line above represented successive pixels across the
> image--left to right and top to bottom.
> Not so.
> This is really screwy. If I set the imagedata of my image to the
> imagedata of itself, it is transformed from a short red line to a
> solid red square. Actually that is what I would have thought the
> column above represented.
> You image people out there live in a different world. I'm sure I'll
> get this in time, but right now I see that I was living in a fools
> paradise when working with graphics objects.
> Jim Hurley
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