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Date Posted: 16:35:18 06/25/01 Mon
Author: Gregg Van Oss
Subject: RGB property troubles

I’m having some troubles with the RGB property on an ImageScrollBox.Graphic. I need to both set values, and read values. Setting a value doesn’t seem to have any effect. For example, I tacked in a test line…

for r:=1 to 100 do ImageScrollBox1.graphic.RGB[r,r]:=MakeRgb(255,0,0);

I would expect to see a diagonal red line over the existing image, but I don’t get that. The line of code has no visible effect.

Reading values is a bit hairier. I have an image that’s 500x500 in the ImageScrollBox. First, I resize the image to 288x288. A check of the ImageScrollBox.Graphic.Width confirms that the resize transform successfully changed the image size to 288x288. However, if I use the graphic.RGB property to pull out the leftmost 288 pixels (Which should now be the entire image), and reassemble them on another canvas, I find that I’m only getting the left half of the image. It’s as if the RGB property is pulling values from the original image, before the resize.

The logic that pulls the values from the ImageScrollBox.Graphic.RGB and reassembles them on another canvas produces the same result regardless of what size I transform the original image to.

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