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Mask Mode Combo Box
This combo box allows the user to choose between different masks that will be applied to the color values of
the image.
Depending on the loaded picture as well as the selected pixel format one or more of the mask modes will
become available.

Original Mode
This is only available for the original image. That means when the pixel format of the original image
is selected in the Pixel Format Combo Box - which is always the first one in the list.
When choosing this option only the original data without any masking or conversion will be
displayed on the different pages.

Color Only Mode
This option only considers the color values R, G, B of an image and ignores the Alpha.
The original image will first be converted into a 32bit ARGB image - this must be done to get an
exact position-to-color related copy - especially for indexed formats.
Afterwards the alpha channel will be removed before the manipulated image will be inserted into
the converter where the destination pixel format will be applied.
Finally the resulting image will be displayed.

Alpha Only Mode
This option only considers the alpha channel of the image and ignores the color values R, G, B.
The original image will first be converted into a 32bit ARGB image - this must be done to get an
exact position-to-color related copy - especially for indexed formats.
Afterwards all color channels will set to the same value of the alpha channel to get a greyscaled
copy of the image that represents the alpha channel.
This copy will then be inserted into the converter where it is transformed into another greyscaled
copy with the destination pixel format.
At the end the converted output will then be manipulated to get back the alpha channel only while
resetting the color values to 0 (black).
The user can change the default color of 0 (black) by means of the Alpha Mask Color Selection Box.
The colors on the grid of the Color Palette Page represent the alpha values as greyscaled palette,
whereas the values in the text box are the correct ones.

Inverted Alpha Only Mode
Same as Alpha Only Mode but with inverted alpha map.

Alpha + Color Mode
It is similar to the Original mode with the difference that it is only available for the 32bit ARGB pixel
format - independent if it is the same format than the original.
Furthermore the displayed information and data was the result of the converter.
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