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2. Wikipedia:Uploading images

   en.wikipedia.org/wiki/Wikipedia:Uploading_images

   To include an image as a thumbnail, use [[File:filename.jpg|thumb|Caption]]. Mini how-to The Upload File Screen , which you will find at Special:Upload , has three fields:

3. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   The JPEG filename extension is JPG or JPEG. Nearly every digital camera can save images in the JPEG format, which supports eight-bit grayscale images and 24-bit color images (eight bits each for red, green, and blue). JPEG applies lossy compression to images, which can result in a significant reduction of the file size.

4. Comparison of image viewers - Wikipedia

   en.wikipedia.org/wiki/Comparison_of_image_viewers

   Add Text, crop, cut/copy selected area, paste-Into selected area, paste from print screen, resize/resample, rotate, flip vertically/horizontally, JPEG lossless transformations, color adjustments, change color depth, greyscale, red-eye reduction, sharpen, effects/filters, own and 8bf (Photoshop) plugins compatibility, edit IPTC info, move, copy ...

5. Generation loss - Wikipedia

   en.wikipedia.org/wiki/Generation_loss

   While directly copying a JPEG file preserves its quality, opening and saving it in an image editor creates a new, re-encoded version, introducing subtle changes. Social media platforms like Facebook and X, formerly known as Twitter, automatically re-encode uploaded images at low-quality settings to optimize storage and bandwidth, further ...

6. Exif - Wikipedia

   en.wikipedia.org/wiki/Exif

   Exchangeable image file format (officially Exif, according to JEIDA/JEITA/CIPA specifications) [5] is a standard that specifies formats for images, sound, and ancillary tags used by digital cameras (including smartphones), scanners and other systems handling image and sound files recorded by digital cameras.

7. Lossy compression - Wikipedia

   en.wikipedia.org/wiki/Lossy_compression

   Composite image showing JPG and PNG image compression. Left side of the image is from a low-quality JPEG image, showing lossy artefacts; the right side is from a PNG image. In information technology , lossy compression or irreversible compression is the class of data compression methods that uses inexact approximations and partial data ...