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2. Wikipedia:Preparing images for upload - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Preparing_images...

   Since most JPEGs in Wikipedia will be rescaled anyway before appearing on pages, a quality setting of 95 is appropriate. (Settings above 95 increase size dramatically for little improvement in image quality.) JPEG compression works better on slightly blurred images, so don't sharpen the images too much as it will result in a higher footprint.

3. Crop factor - Wikipedia

   en.wikipedia.org/wiki/Crop_factor

   (A lens with a higher focal length gives a narrower field of view at the same image sensor or film size, see Angle of view (photography).) If it is desired to capture an image with the same field of view and image quality but different cameras, the aperture and ISO settings also need to be adjusted with respect to the crop factor. [1]

4. Wikipedia : Featured picture criteria/Image size

   en.wikipedia.org/.../Image_size

   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.

5. Cropping (image) - Wikipedia

   en.wikipedia.org/wiki/Cropping_(image)

   Cropping is the removal of unwanted outer areas from a photographic or illustrated image. The process usually consists of the removal of some of the peripheral areas of an image to remove extraneous visual data from the picture, improve its framing, change the aspect ratio, or accentuate or isolate the subject matter from its background.

6. Wikipedia:Basic bitmap image editing - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Basic_bitmap...

   Try to keep internet images around 50 kbytes, and test the page display under a slow connection. Resizing (to emphasize details) In general, first crop out border areas, then adjust colors, then scale the image, and in the last instance probably reduce the color depth. This guarantees as little processing loss as possible. Select the Image menu.

7. Help:Pictures - Wikipedia

   en.wikipedia.org/wiki/Help:Pictures

   This can be awkward if the image is quite large, for the full size image will be displayed when the user clicks the link. Finally, you can link to one image from a thumbnail's small double-rectangle icon , but display another image using "|thumb=Displayed image name". This is intended for the rare cases when the Wikipedia software that reduces ...