How to set transperence colour for Overlays

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This topic and its replies were posted before the current version of LEADTOOLS was released and may no longer be applicable.

#1 Posted : Wednesday, August 12, 2009 12:25:30 AM(UTC)

pkamat

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Posts: 9

The setTransperency function takes a int for colouroverlay. So how do i convert RGB to int?

                    overlayProcessor.OverlayImageFileName = "C:\overlay.bmp";
                    overlayProcessor.set_Region(LMVVOvLyLib.LayerTypeConstants.LAYERTYPE_OVERLAYIMAGE,
                        LMVVOvLyLib.RegionConstants.REGION_RECT);
                    overlayProcessor.set_Region(LMVVOvLyLib.LayerTypeConstants.LAYERTYPE_OVERLAYIMAGE,
                        LMVVOvLyLib.RegionConstants.REGION_RECT);

                    overlayProcessor.set_EnableTransparency(LMVVOvLyLib.LayerTypeConstants.LAYERTYPE_OVERLAYIMAGE, true);
                    overlayProcessor.set_TransparentColor(LMVVOvLyLib.LayerTypeConstants.LAYERTYPE_OVERLAYIMAGE, 255);


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#2 Posted : Wednesday, August 12, 2009 7:31:06 AM(UTC)

Basel

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Posts: 3,022

Was thanked: 2 time(s) in 2 post(s)

If you want to convert a .NET system color to an integer, use code similar to this:

System.Drawing.Color c = [some color value];
int rgbVal = c.ToArgb();
int colorVal = ((rgbVal & 0xFF) * 0x10000 + (rgbVal & 0xFF00) + (rgbVal & 0xFF0000) / 0x10000);

#3 Posted : Wednesday, August 12, 2009 8:13:34 AM(UTC)

pkamat

Groups: Registered
Posts: 9

thank you dude.. guess it doesnt support a range of value, like 175 to 255.

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