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Hi all,
In my work I use scanned maps that I often need to put together to create a larger map. For this I use MapInfo, which has the ability to convert one of the colors in an image to transparent, which is quite handy for eliminating white spaces on overlapping adjacent map boundaries.
So, i used a polygonal lasso tool to very precisely select the image area, inverted the selection to select its rim and tried applying the fill tool to fill the rim area with white (RGB: 255, 255, 255). Blending mode Normal, Opacity 100%. The image is displayed on the Background layer, with Opacity and Fill both at 100%. According to Help, various books and tutorials that should fill every pixel of the selected area with the selected color, right?
Well, apparently not. A small number of pixels retained some color, simply going lighter. Even after several subsequent uses of the fill tool, I can still see them like ghosts on the white background, and Info tool gives me their RGB values as e.g. 254, 253, 254. I tried using the Eraser tool on the selected area (needless to say the background color is white), to no avail.
Tried creating a new layer, copying the selection to it, setting again the layer opacity and fill to 100%, filling it with white – no go. The ghosts are still there, the histogram of the selected area showing them clearly.
The image is an RGB JPEG. When I do the same thing on some BMP files that are in Indexed color mode everything is OK, of course, I guess because of the simpler color scheme.
So, my question is: how do I fill *every* #$% pixel of the selected area with *exactly* the same color, and am I doing something wrong ?
TIA
Nash
In my work I use scanned maps that I often need to put together to create a larger map. For this I use MapInfo, which has the ability to convert one of the colors in an image to transparent, which is quite handy for eliminating white spaces on overlapping adjacent map boundaries.
So, i used a polygonal lasso tool to very precisely select the image area, inverted the selection to select its rim and tried applying the fill tool to fill the rim area with white (RGB: 255, 255, 255). Blending mode Normal, Opacity 100%. The image is displayed on the Background layer, with Opacity and Fill both at 100%. According to Help, various books and tutorials that should fill every pixel of the selected area with the selected color, right?
Well, apparently not. A small number of pixels retained some color, simply going lighter. Even after several subsequent uses of the fill tool, I can still see them like ghosts on the white background, and Info tool gives me their RGB values as e.g. 254, 253, 254. I tried using the Eraser tool on the selected area (needless to say the background color is white), to no avail.
Tried creating a new layer, copying the selection to it, setting again the layer opacity and fill to 100%, filling it with white – no go. The ghosts are still there, the histogram of the selected area showing them clearly.
The image is an RGB JPEG. When I do the same thing on some BMP files that are in Indexed color mode everything is OK, of course, I guess because of the simpler color scheme.
So, my question is: how do I fill *every* #$% pixel of the selected area with *exactly* the same color, and am I doing something wrong ?
TIA
Nash
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