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Compression of an image to reduce file size (in Kb) is usually "lossy" and is not advised for featured pictures. Image compression will reduce download times and save disk space, but it does so at the expense of fine detail and overall image quality. If in doubt, when saving JPEG files, always select the "maximum" quality setting.
Image compression is a type of data compression applied to digital images, to reduce their cost for storage or transmission. Algorithms may take advantage of visual perception and the statistical properties of image data to provide superior results compared with generic data compression methods which are used for other digital data.
Size of this JPG preview of this PDF file: ... (806 × 1,237 pixels, file size: 264 KB, MIME type: application/pdf) ... File change date and time:
Size of this JPG preview of this PDF file: ... file size: 640 KB, MIME type: application/pdf) ... File change date and time:
Like any resampling operation, changing image size and bit depth are lossy in all cases of downsampling, such as 30-bit to 24-bit or 24-bit to 8-bit palette-based images. While increasing bit depth is usually lossless, increasing image size can introduce aliasing or other undesired artifacts.
Size of this JPG preview of this PDF file: ... file size: 768 KB, MIME type: application/pdf) ... File change date and time: