James,
You are on the right track. Your interpretation of the pixels is
correct. However, I would pay special attention to the size of your
image - setting the imageData can reset scaling you have done, which
off of the top of my head is probably why you are seeing a line
become a square - one is just a stretched out version of the other.
Generally speaking, when setting the imageData you want to make sure
the two images are the same size both before (and in this case after)
the operation. Try locking the size and location of the image, or
making sure you haven't resized anything.
Hope this helps a bit.
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:
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
0,156,0,2,
etc.
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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