Nash wrote:
> 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
> , 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

Do you have the Tolerance setting on your Fill Tool set to less than 255?

R.