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Chapter 5. Getting Images into GIMP

Details: The third type, indexed images, is a bit more complicated to understand. In an indexed image, only a limited set of discrete colors are used, usually 256 or less. These colors form the “ colormap ” of the image, and each point in the image is assigned a color from the colormap. Indexed images have the advantage that they can be represented inside a computer in a way which consumes

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Chapter 5. Getting Images into GIMP

Details: The third type, indexed images, is a bit more complicated to understand. In an indexed image, only a limited set of discrete colors are used, usually 256 or less (so, this indexed mode can be applied only to images with 8 bits precision).

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Chapter 6. Getting Images out of GIMP

Details: There are several commands for saving images. A list, and information on how to use them, can be found in the section covering the File Menu.. GIMP allows you to export the images you create in a wide variety of formats. It is important to realize that the only format capable of saving all of the information in an image, including layers, transparency, etc., is GIMP's native XCF format.

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Chapter 6. Getting Images out of GIMP

Details: Images using arithmetic encoding can be 5 - 10 % smaller. But older softwares may have trouble opening these images. Use restart markers. The image file can include markers which allow the image to be loaded as segments. If a connection is broken while loading the image in a web page, loading can resume from the next marker.

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4.4. Compressing Images

Details: If you have images that take up a large space on disk, you can reduce that space even without changing the image dimensions. The best image compression is achieved by using the JPG format, but even if the image is already in this format, you can usually still make it take up less space, as the JPG format has an adaptive compression scheme that allows saving in varying levels of compression.

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2. Preparing your Images for the Web

Details: 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. Images with an Optimal Size/Quality Ratio. An optimal image for the web depends upon the image type and the file format.

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Chapter 6. Getting images out of GIMP

Details: There are several commands for saving images. A list, and information on how to use them, can be found in the section covering the File menu. GIMP allows you to save the images you create in a wide variety of formats. It is important to realize that the only format capable of saving all of the information in an image, including layers, transparency, etc., is GIMP's native XCF format.

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Chapter 1. Digital image representation

Details: Bitmap images take up a lot of memory, image compression reduces the amount of memory needed to store an image. For instance a 2.1 megapixel, 8bit RGB image (1600x1200) occupies 1600x1200x3 bytes = 5760000 bytes = 5.5 megabytes, this is the uncompressed size of the image.

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4.2. Change the Size of an Image (Scale)

Details: Perhaps you want your image to look more like a 4x6 inch photo on most image rendering web browsers. Switch the units to “ inches ” and enter 4 inches in the height box (opting for smaller than 4x6 rather than bigger). You can see this dialog above. Let GIMP choose the other dimension length for you. Meaning, it requires more image

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4.3. Change the Size of an Image for print

Details: By default, most images open with the resolution set to 72. This number was chosen for historical reasons as it was the resolution of screens in the past, and means that when printed, every pixel is 1/72 of an inch wide. When printing images are taken with modern digital cameras, this produces very large but chunky images with visible pixels.

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2.3. Saving Images with Transparency

Details: Saving Images with Transparency There are two different approaches used by graphic file formats for supporting transparent image areas: simple binary transparency and alpha transparency. Simple binary transparency is supported in the GIF format; one color from the indexed color palette is marked as the transparent color.

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4.3. Make JPEGs Smaller

Details: You can make your jpegs smaller (use less space on disk) without changing the image dimensions. The image for this example is also take from APOD [APOD04].The original image is huge (3000 pixels wide) so first I reduced the width and height for better use on the web (see Section 4.2, “Change the Size of …

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4.2. Change the Size of an Image for the screen

Details: The first thing that you might notice after opening the image, is that GIMP opens the image at a logical size for viewing. If your image is very large, like the sample image, GIMP sets the zoom so that it displays nicely on the screen. The zoom level is shown in the status area at the bottom of the Image window.

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8.9. Brightness-Contrast

Details: The Brightness-Contrast tool adjusts the brightness and contrast levels for the active layer or selection. This tool is easy to use, but relatively unsophisticated.

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Chapter 12. Enrich my GIMP

Details: If you work with very large images, or images with many layers, or have many images open at once, GIMP can potentially require hundreds of megabytes of swap space, so available disk space and performance are definitely things to think about for this folder. By default, it is set to your personal GIMP directory, but if you have another disk with

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6.27. Align Visible Layers…

Details: Note; In GIMP 1.2, the default base for the alignment was the top visible layer in the stack.In GIMP 2, the default alignment base is the edge of the canvas.You can still align the image on the bottom layer of the stack, even if it is invisible, by checking Use the (invisible) bottom layer as the base in the dialog.

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5. How to Draw Straight Lines

Details: This tutorial shows you how to draw straight lines with GIMP.Forcing a line to be straight is a convenient way to deal with the imprecision of a mouse or tablet, and to take advantage of the power of a computer to make things look neat and orderly.

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2.5. Open as Layers…

Details: The Open Image as layers command opens the Open Image dialog. The layers of the selected file are added to the current image as the top layers in the stack.

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Hoofdstuk 8. Afbeeldingen combineren

Details: When you work with images containing many layers, with varying opacity, you often can get a better picture of the contents of the layer you want to work on by hiding some of the other layers. Tip Wanneer u de Shift -toets ingedrukt houdt terwijl u op het oog-symbool klikt wordt de zichtbaarheid van alle lagen, behalve de aangeklikte uit gezet

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