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Date Posted: 17:55:27 06/26/01 Tue
Author: Michel
Subject: Re: RGB property troubles
In reply to: Gregg Van Oss 's message, "RGB property troubles" on 16:35:18 06/25/01 Mon


Hi Gregg,

When doing changes like,

ImageScrollBox1.graphic.RGB[r,r]:=

you need to then call ImageScrollBox.Redraw(True).

In the second situation, I would guess that your are resizing the image with the ZoomPercent property. The ImageScrollBox has to graphic properties: Graphic which is the original non-resized graphic, and DisplayedGraphic which is the resized graphic.

You may want to use the TResizeTranform to directly resize a TGraphic.

Best regards,

Michel

>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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