. . . . . . . . . . . . . . . . . . . . . . . . . 67 6.2.1 Images with an Optimal Size/Quality Ratio . . . . . . . . . . . . . . . . . . . . . . 67 6.2.2 Reducing the File Size Even More . . . . . physical space. To set up an image for printing, we use a value called resolution, defined as the ratio between an image’s size in pixels and its physical size (usually in inches) when it is printed on paper, GIMP needs to know how big each pixels is. We use a parameter called resolution to set the ratio between pixels and real-world units such as inches. By default, most images open with the resolution

. . . . . . . . . . . . . . . . . . . . . . . . . 72 6.2.1 Images with an Optimal Size/Quality Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72 6.2.2 Reducing the File Size Even still, make sure that the ‘Preview’ toggle is on and then watch the image area and change the compression level by moving the ‘Quality’ slider down. You can see the quality of the image changing, especially Figure 3.19: Example for High JPEG Compression (a) Quality: 0.06; Size: 1361 Bytes (b) Quality: 0.42; Size: 3549 Bytes Figure 3.20: Example for Moderate JPEG Compression (a) Quality: 0.85 (GIMPs default);

Scale in X direction only Ctrl + {1} Scale in Y direction only Shift + Ctrl + {1} Scale with fixed ratio Shearing mode {1} Free shearing Perspective mode {1} Move point All {1} + {3} - {3} Preview and opening images. Guash uses xv to create its thumbnail images. • gzip, to enable extra file compression/decompression of any image format. To check whether you have gzip, type gzip -h. If you get an message, either you have not installed gzip or it is not in your path. • bzip, to enable extra file compression/decompression of any image format. To check whether you have bzip, type bzip -h. If you receive

programs. JPG (or JPEG) Joint Photographic Expert Group Saves storage space using lossy compression. Most commonly used with digital photos. GIF Graphics Interchange Format Can only store for its ability to store animations. PNG Portable Network Graphics Provides better lossless compression than BMP and GIF. TIF (or TIFF) Tagged Image File Format Store one or multiple images in for individual images. The ratio of the width and the height is called the aspect ratio. For example a 800 × 600 photo has an aspect ratio of 4 : 3. If the ASPECt RAtio of A photo is chANged in enlArgement

smaller file size with minimal degradation of image quality. Images with an Optimal Size/Quality Ratio An optimal image for the web depends upon the image type and the file format you have to use. If web site. You can save your image in PNG format with the default settings, but using maximum compression. Doing this will have no negative affects on the quality of the picture, as it would have with better off saving it as jpeg. The main thing is to find the best tradeoff between quality and compression. You can find more information about this topic in . Reducing the File Size Even More If you

different Modes Different tips available Size determines how large the tip is Aspect ratio changes the width vs height of tip. Changes Angle of the tip. Highly visible in squarish