![]() The GIMP : free, open-source, full-featured image editor with scripting capabilities Windows, Mac OS/X, Unix.the same feature set as IrfanView, and appropriate for the same uses. XnView: free crops, scales, converts, etc.jpg format or creating thumbnails from a batch of images. Useful for batch processing, for example converting a batch of images to. IrfanView: free crops, scales, and converts but has only limited enhancement tools.File size recommendations are described in "Exporting to the Final Output Format".Īny image editing software with a reasonable set of features can be used for processing images. This is discussed in detail in "Exporting to the Final Output Format". that the size of the archive file that contains the book is of a reasonable size for downloading (which is largely determined by the image file size)īecause of these size limitations, the biggest challenge of image processing is reducing image file size without sacrificing image quality.that the image is of an appropriate size for the page (determined by the image dimensions). ![]() that the page does not take too long to load when the book is read on-line (which is largely determined by the size of the images).Project Gutenberg imposes file size limitations on images that accompany books. Resizing and saving: reducing the image size, compressing and saving the image in a format suitable for the image type.Optimizing for display on a computer: sharpening the image, enhancing image contrast, cropping erroneous areas from the image, etc.Fixing damage and scanning artifacts: removing the page texture, fixing page creases and stains, straightening the image layout, etc.When the HTML version of a book is created, the scanned images from the book are altered to make them suitable for display within an HTML page. Content Providers may also refer to Wiki article Image cleanup. Scanning is beyond the scope of this tutorial however, these threads are useful: How much to compress in-line and linked images? and Picture scanning FAQ. Because the images are scanned at a high resolution, the image files are large consequently, the zip file containing all the images can be very large (50 MBs and more) if the book has a lot of images. When you download a PP package, there's a separate link for downloading the book's images. It is measured in dots per inch ( DPI).) In addition to the low-resolution scans, high resolution scans are made of the pages containing images (illustrations, maps, photographs, etc). ("Resolution" refers to the density of pixels within an image. When a book is scanned, each page is scanned at a low resolution that is sufficient for proofreading. For information on cover preparation, please read PP_guide_to_cover_pages.This ensures that your monitor displays "true" representations of black, white and color. Otherwise you'll waste time using your image software's correction tools trying to correct image flaws that are, in fact, gunk on the monitor surface. 4.6 Exporting to the Final Output Format.4.5.2 Image Display Dimensions: General Guidelines.4.5.1 Image Display Dimensions - Considerations. ![]()
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