GIMP bruges meget til at forberede billeder til websteder. Billeder til brug på nettet skal tage sig så godt ud som muligt, mens filstørrelsen holdes så lille som muligt. Denne trin for trin-vejledning viser, hvordan man laver små filer med minimalt kvalitetstab.
An optimal image for the web depends upon the image type and the file format. Use JPEG for Photographs because they usually have many colors and great detail. An image with fewer colors, such as a button, icon, or screenshot, is better suited to the PNG format.
Åbn et billede som sædvanligt. Her er valgt et billede af Wilber som eksempel.
Billedet er nu i tilstanden RGB og indeholder desuden en alfakanal (RGBA). Sædvanligvis behøver dit billede til nettet ikke en alfakanal. Du kan fjerne alfakanalen ved at forene billedets lag.
Det er sjældent, et fotografi har en alfakanal, så billedet vil åbne i tilstanden RGB og ikke RGBA, og der vil derfor ikke være nogen alfakanal at fjerne.
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If the image has a soft transition into the transparent areas, you should not remove the alpha channel, since the information used for the transition is not be saved in the file. To export an image with transparent areas that do not have a soft transition, (similar to GIF), remove the alpha channel. |
After you have flattened the image, export the image in the PNG format for your web site.
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You can export your image in the PNG format with the default settings. Always using maximum compression when creating the image. Maximum compression has no effect on image quality or the time required to display the image, but it does take longer to export. A JPEG image, however, loses quality as the compression is increased. If your image is a photograph with lots of colors, you should use jpeg. The main thing is to find the best tradeoff between quality and compression. You can find more information about this topic in Afsnit 5.5.3, “Export Image as JPEG”. |