When images are larger than the page margins allow, Reader automatically scales images to fit the page. When images are scaled, their aspect ratio is always maintained and images are shrunk only as much as needed to fit the image on the page. Reader moves an image to the next page to fit without shrinking, even if this results in a large amount of white space remaining on the page where the image might have normally appeared.
Express image sizes as percentages of the active area of the page so that image resizing control is performed according to guidelines provided by the content author and not automatically by the system.
Reader supports .jpg, .gif and .png image formats. .jpg and .png images are the most tolerant of resizing. Resizing occurs whenever an image is larger or smaller than the Reader size—and the Reader footprint on the screen is quite variable. In fact, the Reader always scales to 92% of the height of the screen. This determines the page height, which then influences every image, beginning with the cover. For instance, because the aspect ratio of the cover graphic is always 3:4, the width of the Reader is always 75% of 92% of the page height. The title-standard image is then 18% of that width.
Warning: Reader does not support and cannot display .jpg images made with 4 colors (CMYK), such as those used in Adobe PhotoShop 3.0 (but not PhotoShop 4.0). The image library in Reader handles only 1 color (for grayscale) or three (RGB) colors.
Finally, Reader does not support the alt attribute to display text associated with an image, or the lowsrc attribute to encode alternative images.
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