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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.
variable size: Start Of Frame (progressive DCT) Indicates that this is a progressive DCT-based JPEG, and specifies the width, height, number of components, and component subsampling (e.g., 4:2:0). DHT 0xFF, 0xC4: variable size: Define Huffman Table(s) Specifies one or more Huffman tables. DQT 0xFF, 0xDB: variable size: Define Quantization Table(s)
The aspect ratio of each image is automatically retrieved from the File metadata. You can override the native width and height values by Examining the individual image pages to obtain the full resolution. For example: File:Donkey 1 arp 750px.jpg shows "Donkey_1_arp_750px.jpg (750 × 536 pixels, file size: 125 KB, MIME type: image/jpeg)"
Still images should be a minimum of 1500 pixels in width and height (1500×1500px); larger sizes are generally preferred. The size of animated images is judged less strictly, though larger is still preferred. Further information on image size can be found here.
The parameter upright=1 returns the same size as thumbnail width, and upright=0.75 is functionally identical to upright alone. If you set scaling factor equal to the image's aspect ratio (width divided by height) the result is equivalent to scaling the height to be equal to the normal thumbnail width.
Image using width upright=1.8, so that it is 80% wider than the Siberian Husky image above (which is at the default upright=1 width) Image using upright=0.5; a scaling factor less than 1 contracts the image width. An image's size is controlled by changing its width – after which software automatically adjusts height in proportion.