ac6a5dae50
Thu Dec 16 20:15:25 CET 1999 Olof S Kylande <olof@gimp.org> Fix of KDE/Kwm selection add/sub/inter problem NOTE: This is a workaround, not a real fix. Many Thanks to Matthias Ettrich * app/disp_callbacks.c Updated unsharp-mask to version 0.10 * plug-ins/unsharp/dialog_f.c * plug-ins/unsharp/dialog_f.h * plug-ins/unsharp/dialog_i.c * plug-ins/unsharp/dialog_i.h * plug-ins/unsharp/unsharp.c Updated print plug-in to version 3.0.1 * plug-ins/print/README (new file) * plug-ins/print/print-escp2.c * plug-ins/print/print-pcl.c * plug-ins/print/print-ps.c * plug-ins/print/print-util.c * plug-ins/print/print.c * plug-ins/print/print.h Updated all files in the help/C/dialogs dir. This is a first alpha glimpse of the help system. Please give me feedback of the content. However since it's in alpha stage it means that there is spell, grammatical, etc errors. There is may also be pure errors which I hope "you" will report to either olof@gimp.org or karin@gimp.org. Please don't report spell, grammatical, etc error at this stage in dev. If you have any plans to commit to the help system please write to olof@gimp.org. (This is mandatory not a please ;-). * help/C/welcome.html * help/C/dialogs/about.html ..............
141 lines
5.3 KiB
HTML
141 lines
5.3 KiB
HTML
<!doctype html public "-//w3c//dtd html 4.0 transitional//en">
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<HTML>
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<HEAD>
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<META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1">
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<TITLE>Indexed Mode</TITLE>
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</HEAD>
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<BODY text="#000000" bgcolor="#FFFFFF" link="#0000FF" vlink="#FF0000" alink="#000088">
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<TABLE width="100%" cellspacing="1" cellpadding="1">
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<TR bgcolor="black">
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<TD width="100%" align="center"><FONT size="+2" color="white">Indexed
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Mode</FONT></TD>
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</TR>
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<TR bgcolor="white" >
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<TD width="100%" align="left"><P>
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<P>
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This mode enables you to convert your RGB or Grayscale Image to an Indexed
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image. An Indexed image is a image which only can have the colors specified
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in it's color palette present in the image file. The maximum number of colors
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in a Index image is 256. If you want to make e.g transparent GIF images then
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you can only have a maximum of 255 colors since the last color (i.e color
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number 256) will be used to determine if the pixel is opaque or transparent.
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<H4>
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Palette Options
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</H4>
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<DL>
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<DD>
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<DT>
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<EM>Generate optimal palette:</EM>
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<DD>
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This is most of the time the best options to create a indexed image with.
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Gimp will evaluate your colors and create a color palette suitable for the
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image. You can specify the amount of colors that you want to have in your
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index image but remember that you can't have more than 255 colors if are
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about to create a index image with transparency.
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<DT>
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<EM>Use custom palette:</EM>
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<DD>
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If you want to use a predefined palette you have to use this option. You
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have to choose your palette from the drop down menu, by default it's Web
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palette. The Web palette is the palette used by e.g Netscape. This will help
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you create web safe index images images (There is some debate if you should
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index against the Web palette or not. Please see The Gimp User's Manual page
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XXXX for further information).
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<DL>
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<DT>
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<EM>Custom Palette Options:</EM>
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<DD>
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Remove unused colo(u)rs from final palette: If palette contains colors that
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aren't used in the Index image you can remove those colors and make the image
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file size smaller. This is a good option so keep it enabled.
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</DL>
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<DT>
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<EM>Use black/white (1-bit) palette:</EM>
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<DD>
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This option will create a "grayscale" image only built up of either black
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or white pixels.
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</DL>
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<H4>
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Dithering
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</H4>
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<P>
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An Index image can only be built up of a maximum of 256 colors. Most of the
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time this is quite limited and you will not be able to have all the colors
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in your image represented in this limited color space. The image will look
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like it is built up of "bands" or "color areas". To make Index images look
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better you can dither them. This means that you will mix two or several colors
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to mimic the missing color. The disadvantage is that the image can look like
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it's built up of "dots".
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<P>
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<DL>
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<DT>
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<EM>No colo(u)r dithering:</EM>
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<DD>
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Will disable dithering totally
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<DT>
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<EM>Positioned colo(u)r dithering:</EM>
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<DD>
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This is a option to use when you are dealing with animations (e.g gif
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animations). The problem with dithering with e.g Floyd Steinberg dithering
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in animations is that the dithering will not be constant. If you instead
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use positioned dithering the dithering in constant areas will remain constant
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across your frames. It is not as good as Floyd Steinberg dithering but is
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better than no dithering at all.
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<DT>
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<EM>Floyd Steinberg dithering colo(u)r dithering (reduced colo(u)r
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bleeding)</EM>
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<DD>
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When you use normal Floyd Steinberg dithering you will experience that the
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colors will bleed to much . This is very visible when you index gradients,
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the effect is that the gradient will look unnatural. If you encounter this
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effect it's advisable to use this option (i.e Floyd Steinberg dithering reduced
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colour bleeding).
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<DT>
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<EM>Floyd Steinberg dithering (normal):</EM>
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<DD>
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This is the best option to use when you are indexing images. It's only in
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special cases that you will use the other dithering methods available.
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<DT>
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<DD>
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<DT>
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<EM>Enable dithering of transparency:</EM>
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<DD>
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Index images only have one transparency mode either it is off (the pixel
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is totally solid) or on (the pixel is totally transparent). This makes it
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very difficult to index images with smooth transitions from opaque to
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transparent. When you enable dithering of transparency Gimp will try to mimic
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the smooth transition by dithering pixels on and off. Note: A good alternative
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to transparency dithering is the
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<CODE><A HREF="../filters/semiflatten.html">right-click|Filters|Colors|Semi-Flatten</A></CODE>
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function.
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</DL>
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<H3>
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Additional Information
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</H3>
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<P>
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For further information see The Gimp User's Manual page XXXX and the Gimp
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User's Tutorial page YYYY
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<P>
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Shortcut Key
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<P>
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Modifier
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<P>
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Drag and Drop
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<P>
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Xinput
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<P>
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----DEV----
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<P>
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<A href="index.html">Index</A>
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<P>
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(/dialogs/convert_to_indexed.html)
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<P>
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Sorry but the help file for convert_to_indexed is not yet done.
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<P>
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/Karin & Olof
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<P>
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</TD>
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</TR>
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</TABLE>
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</BODY></HTML>
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