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Some image formats, especially
"gif", allow to
manipulate the background
color. |
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This is essentially a
consequence of the data compression technique, where only a limited number of
colors - the palette - is used. |
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The palette, however, is not fixed, but
calculated for each image for optimum color fidelity. A picture of a landscape,
e.g. may contain several shades of green in the palette, while portraits will
expand the red and yellow hues. |
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The colors used for a palette are
numbered internally and you can find the color
number in the following way: |
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Load a .gif image in Paint Shop Pro and click on
the "pipette" symbol
("Farbauswahl"). Move it on any color in your image and watch the
color menu on the right hand side. Below the listing for Red, Green and
Blue, an "I" with a number
will appear - this is the internal number for the color you picked. |
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You now can manipulate one of the colors
contained in the image - usually the background color - when you save the
picture, e.g., by making this color transparent. This means that the
chosen color will not appear in the context of the setting for the picture, but
that the background color of the master document into which the picture may be
embedded will be seen instead. |
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This applies directly to .gif pictures embedded
in a HTML document. Paint Shop Pro offers four choices how this can be
done: |
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When you click on "save" (Sichern als"), you have can open a
menu "options" ("Options"). Click on it (and don't forget
to save it as ".gif"). There are four choices: |
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"Beibehalten der Transparenz-Information der
Datei" ("Keep the transparency information
of the file"). This means that if the picture already has some
setting for the transparency of one color, this setting will be kept. |
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Keine Transparenz-Information speichern (Do not safe any transparency information). This
means that nothing will be transparent after you safe the picture. |
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Setzen des Transparenzwertes für die
Hintergrundfarbe (Make the background color
transparent). If you chose this option, the background color (as
determined by Paint Shop Pro) will be the color that becomes
transparent. |
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"Setzen des Transparenzwertes im
Paletteneintrag" (Make the chosen color
transparent) - with a choice of a number via a menu. To use this,
you first have to find the number of the color you want to be transparent with
the "pipette" (Farbauswahl). Then
you indicate that number in the menu; it will be transparent after saving the
picture. |
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Try it with some pictures. Use a
photography and a drawing and see how Paint Shop pro will determine the
background color |
