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2. Image scaling - Wikipedia

   en.wikipedia.org/wiki/Image_scaling

   Image scaling can be interpreted as a form of image resampling or image reconstruction from the view of the Nyquist sampling theorem.According to the theorem, downsampling to a smaller image from a higher-resolution original can only be carried out after applying a suitable 2D anti-aliasing filter to prevent aliasing artifacts.

3. Comparison gallery of image scaling algorithms - Wikipedia

   en.wikipedia.org/wiki/Comparison_gallery_of...

   An adaptable technique which can deliver variable amounts of detail or smoothness. It aims to preserve the shape and coordinates of original details, without blurring those details into neighboring ones. It will avoid blending pixels which directly touch each other, and instead only blend pixels with their diagonal neighbors.

4. Help : How to reduce colors for saving a JPEG as PNG

   en.wikipedia.org/wiki/Help:How_to_reduce_colors...

   Instead, just eliminate JPEG artifacts as much as possible and convert to 24-bit PNG. Using the posterize option of your graphics editor with a high setting (like 40) may further reduce filesize and eliminate more artifacts without visibly reducing image quality. You can try using pngquant on the 24-bit result; this produces indexed mode images ...

5. pngcrush - Wikipedia

   en.wikipedia.org/wiki/Pngcrush

   pngcrush is a free and open-source command-line utility for optimizing PNG image files. It reduces the size of the file losslessly – that is, the resulting "crushed" image will have the same quality as the source image.

6. Help:Pictures - Wikipedia

   en.wikipedia.org/wiki/Help:Pictures

   Also, compressing PNGs may be useful, because PNG files can be safely resized without losing quality. The default behavior can make a tall, thin picture come out too large. For example:

7. Vector graphics - Wikipedia

   en.wikipedia.org/wiki/Vector_graphics

   This vector-based (SVG format) image of a round four-color swirl displays several unique features of vector graphics versus raster graphics: there is no aliasing along the rounded edge (which would result in digital artifacts in a raster graphic), the color gradients are all smooth, and the user can resize the image infinitely without losing ...

8. 8 Simple Ways To Cut Costs Without Sacrificing Quality - AOL

   www.aol.com/frugal-living-hacks-simple-ways...

   Being frugal doesn't mean skimping out on everything. In fact, there are plenty of ways to scale back on your spending without sacrificing things you enjoy. Read Next: I'm a Frugal Shopper: 4 ...

9. Image file format - Wikipedia

   en.wikipedia.org/wiki/Image_file_format

   The PNG (Portable Network Graphics) file format was created as a free, open-source alternative to GIF. The PNG file format supports 8-bit (256 colors) paletted images (with optional transparency for all palette colors) and 24-bit truecolor (16 million colors) or 48-bit truecolor with and without alpha channel – while GIF supports only 8-bit ...