Best Export Settings Animated Gif Photoshop
Web graphics formats can be either bitmap (raster) or vector. The bitmap formats—GIF, JPEG, and PNG—are resolution-dependent, meaning that a bitmap image’s dimensions, and possibly image quality, will change at different monitor resolutions. The vector formats—SVG and SWF—are resolution-independent and can be scaled up or down without losing any image quality. The vector formats can also include raster data.
JPEG is the standard format for compressing continuous-tone images such as photographs. Optimizing an image as a JPEG format relies on lossy compression, which selectively discards data.
Determines the level of compression. The higher the Quality setting, the more detail the compression algorithm preserves. However, using a high Quality setting results in a larger file size than using a low Quality setting. View the optimized image at several quality settings to determine the best balance of quality and file size.
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Creates an enhanced JPEG with a slightly smaller file size. The Optimized JPEG format is recommended for maximum file compression; however, some older browsers do not support this feature.
Displays the image progressively in a web browser. The image appears as a series of overlays, enabling viewers to see a low-resolution version of the image before it downloads completely. The Progressive option requires use of the Optimized JPEG format.
Specifies the amount of blur to apply to the image. This option applies an effect identical to that of the Gaussian Blurfilter and allows the file to be compressed more, resulting in a smaller file size. A setting of 0.1 to 0.5 is recommended.
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Specifies a fill color for pixels that were transparent in the original image. Click the Matte color swatch to select a color in the color picker, or select an option from the Matte menu: Eyedropper Color (to use the color in the eyedropper sample box), Foreground Color, Background Color, White, Black, or Other (to use the color picker).
Pixels that were fully transparent in the original image are filled with the selected color; pixels that were partially transparent in the original image are blended with the selected color.
GIF is the standard format for compressing images with flat color and crisp detail, such as line art, logos, or illustrations with type. Like the GIF format, the PNG‑8 format efficiently compresses solid areas of color while preserving sharp detail.
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PNG‑8 and GIF files support 8‑bit color, so they can display up to 256 colors. The process of determining which colors to use is called indexing, so images in GIF and PNG‑8 formats are sometimes called indexed color images. To convert an image to indexed color, a color lookup table is built to store and index the colors in the image. If a color in the original image does not appear in the color lookup table, the application either chooses the closest color in the table or simulates the color using a combination of available colors.
Reduces file size by selectively discarding data. A higher Lossy setting results in more data being discarded. You can often apply a Lossy value of 5–10, and sometimes up to 50, without degrading the image. The Lossy option can reduce file size by 5% to 40%.
Specifies a method for generating the color lookup table and the number of colors you want in the color lookup table. You can select one of the following color reduction methods:
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Selective Creates a color table similar to the Perceptual color table, but favoring broad areas of color and the preservation of web colors. This color table usually produces images with the greatest color integrity. Selective is the default option.
Adaptive Creates a custom color table by sampling colors from the predominant spectrum in the image. For example, an image with only the colors green and blue produces a color table made primarily of greens and blues. Most images concentrate colors in particular areas of the spectrum.
Restrictive (Web) Uses the standard 216‑color color table common to the Windows and Mac OS 8‑bit (256‑color) palettes. This option ensures that no browser dither is applied to colors when the image is displayed using 8‑bit color. (This palette is also called the web‑safe palette.) Using the web palette can create larger files, and is recommended only when avoiding browser dither is a high priority.
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Custom Uses a color palette that is created or modified by the user. If you open an existing GIF or PNG‑8 file, it will have a custom color palette.
Determines the method and amount of application dithering. Dithering refers to the method of simulating colors not available in the color display system of your computer. A higher dithering percentage creates the appearance of more colors and more detail in an image, but can also increase the file size. For optimal compression, use the lowest percentage of dither that provides the color detail you require. Images with primarily solid colors may work well with no dither. Images with continuous-tone color (especially color gradients) may require dithering to prevent color banding.
Noise Applies a random pattern similar to the Diffusion dither method, but without diffusing the pattern across adjacent pixels. No seams appear with the Noise dither method.
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Displays a low-resolution version of the image in a browser while the full image file is downloading. Interlacing can make downloading time seem shorter and can assure viewers that downloading is in progress. However, interlacing also increases file size.
Specifies a tolerance level for shifting colors to the closest web palette equivalents (and prevent the colors from dithering in a browser). A higher value shifts more colors.
This allows the background of the web page to show through the transparent areas of your image. Background matting simulates transparency by filling or blending transparent pixels with a matte color that can match the web page background. Background matting works best if the web page background is a solid color and if you know what that color is.
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Use the Transparency and Matte options in the Save For Web & Devices dialog box to specify how transparent pixels in GIF and PNG images are optimized.
To select a matte color, click the Matte color swatch and select a color in the color picker. Alternatively, select an option from the Matte menu: Eyedropper Color (to use the color in the eyedropper sample box), Foreground Color, Background Color, White, Black, or Other (to use the color picker).
Select a slice that is optimized in GIF or PNG‑8 format. The color table for the selected slice appears in the SaveFor Web & Devices color table.
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If an image has multiple slices, the colors in the color table may vary between slices (you can link the slices first to prevent this from happening). If you select multiple slices that use different color tables, the color table is empty and its status bar displays the message “Mixed.”
You use the color table in the Save For Web & Devices dialog box to customize the colors in optimized GIF and PNG‑8 images. Reducing the number of colors often preserves image quality while reducing the file size of the image.
You can add and delete colors in the color table, shift selected colors to web‑safe colors, and lock selected colors to prevent them from being dropped from the palette.
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You can add colors that were left out in building the color table. Adding a color to a dynamic table shifts the color in the palette closest to the new color. Adding a color to a fixed or Custom table adds an additional color to the palette.
You can change a selected color in the color table to any other RGB color value. When you regenerate the optimized image, the selected color changes to the new color wherever it appears in the image.
To protect colors from dithering in a browser, you can shift the colors to their closest equivalents in the web palette. This ensures that the colors won’t dither when displayed in browsers on either Windows or Macintosh operating systems capable of displaying only 256 colors.
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You can lock selected colors in the color table to prevent them from being dropped when the number of colors is reduced and to prevent them from dithering in the application.
You can delete selected colors from the color table to decrease the image file size. When you delete a color, areas of the optimized image that previously included that color are rerendered using the closest color remaining in the palette.
When you delete a color, the color table automatically changes to a Custom palette. This is because the Adaptive, Perceptual, and Selective palettes automatically add the deleted color back into the palette when you reoptimize the image—the Custom palette does not change when you reoptimize the image.
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You can save color tables from optimized images to use with other images and to load color tables created in other applications. Once you load a new color table into an image, the colors in the optimized image are changed to reflect the colors in the new color table.
PNG‑24 is suitable for compressing continuous-tone images; however, it produces much larger files than JPEG format. The advantage of using PNG‑24 is that it can preserve up to 256 levels of transparency in an image.
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