2. Paveikslėlių paruošimas žiniatinkliui

One of the most common uses for GIMP, is to prepare images for web sites. This means that images should look as nice as possible while keeping the file size as small as possible. This step-by-step guide demonstrates how to create small files with minimal loss of image quality.

2.1. Optimalaus dydžio ir kokybės santykio paveikslėliai

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.

  1. Pirma, kaip įprasta atverkite paveikslėlį. Kaip pavyzdys čia atvertas mūsų Vilberio paveikslėlis.

    Pav. 6.2. The Wilber image opened in RGBA mode

    The Wilber image opened in RGBA mode

  2. Dabar paveikslėlis yra RGB veiksenoje su papildomu Alfa kanalu (RGBA). Paprastai žiniatinklio paveikslėliui alfa kanalas yra nereikalingas. Alfa kanalą galite ištrinti suplodami paveikslėlį.

    A photograph rarely has an alpha channel, so the image will open in RGB mode rather than RGBA mode; and you won't have to remove the alpha channel.

    [Pastaba] Pastaba

    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.

  3. After you have flattened the image, export the image in the PNG format for your web site.

[Pastaba] Pastaba

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 Skyrius 5.5.3, „Export Image as JPEG“.