Ericsson AVP 4000, Reference Manual, Page: 419 / 422

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1/1553-FGC 101 1790 Uen Y E-5
If the Changes Affect Palette button is selected, changing the transparency of a
pixel on the image will also change the palette entry on which the pixel is based and
all the pixels that share that palette entry.
If the inactive area is mainly one color, check the
Changes Affect Palette
button
and click in the inactive area. All pixels of that color will become transparent and you
will see the background. Repeat until the whole of the inactive area is transparent. If
parts of the active area have become transparent, uncheck the Changes Affect
Palette box and paint the areas opaque again. Zoom in if necessary.
If there is no general color for the inactive area, uncheck the
Changes Affect
Palette button and paint the inactive area manually. Use the left button to set the
area to the desired transparency and the right button to correct mistakes. Trace
around the edge of the area with a medium brush then use the large brush for wide
areas. Then zoom in and use the small brush to do the fine corrections for individual
pixels.
E.5.3 Adding Transparency Using a Key File
Create the Key File using a drawing package. Color the active area white, the
inactive area black and intermediate areas as shades of grey. Save as a .BMP file.
Click the
Apply Key File
toolbar button and select the file to be used as a Key File.
The areas that were black in the Key File are now transparent (background-colored)
and the areas that were white in the Key File are now opaque.
Change the background color to verify that the correct areas are transparent.
E.5.4 Editing the Palette
The palette is displayed to the right of the image.
The palette will contain at most 256 colors in it. This is the largest number of colors
allowed in an OSD file.
The transparency of each palette entry may be altered in the same way as the
image itself, using the left and right mouse buttons. Changes to the palette are
shown immediately on the image.
E.5.5 Palette Reallocation
When the level of transparency of a pixel in the image is changed, a new color is
effectively created. Whenever the image is downsampled or saved the palette is
rebuilt to reflect the actual colors in the image. The number of colors will also be
reduced to 256 colors if necessary.