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

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

    If the new version is too sharp, you can utilize the blur filter or tool to fix this, or use Colors > Levels to mess with the Alpha channel. Once it looks correct, save the image as a PNG. Then, to reduce file size, run it through a program like ImageMagick that supports 8-bit PNGs with alpha transparency, in order to remove any unnecessary ...

  3. Gaussian blur - Wikipedia

    en.wikipedia.org/wiki/Gaussian_blur

    The difference between a small and large Gaussian blur. In image processing, a Gaussian blur (also known as Gaussian smoothing) is the result of blurring an image by a Gaussian function (named after mathematician and scientist Carl Friedrich Gauss). It is a widely used effect in graphics software, typically to reduce image noise and reduce detail.

  4. Transparency (graphic) - Wikipedia

    en.wikipedia.org/wiki/Transparency_(graphic)

    In addition, transparency is often an "extra" for a graphics format, and some graphics programs will ignore the transparency. Animated PNG 8-bit transparency. Raster file formats that support transparency include GIF, PNG, BMP, TIFF, TGA and JPEG 2000, through either a transparent color or an alpha channel.

  5. PNG - Wikipedia

    en.wikipedia.org/wiki/PNG

    PNG was developed as an improved, non-patented replacement for Graphics Interchange Format (GIF)—unofficially, the initials PNG stood for the recursive acronym "PNG's not GIF". [ 6 ] PNG supports palette-based images (with palettes of 24-bit RGB or 32-bit RGBA colors), grayscale images (with or without an alpha channel for transparency), and ...

  6. 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 ...

  7. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    Adobe Master transparency and blends pdf file; GIMP and Photoshop Blending Modes visually explained and compared, parts one, two, three, and four; JAVA demo on the image blending operator, an interactive JAVA-based image blending demo; All the math behind photoshop compositing (including math for using alpha in complex compositions like softlight)

  8. Moiré pattern - Wikipedia

    en.wikipedia.org/wiki/Moiré_pattern

    Line moiré is one type of moiré pattern; a pattern that appears when superposing two transparent layers containing correlated opaque patterns. Line moiré is the case when the superposed patterns comprise straight or curved lines. When moving the layer patterns, the moiré patterns transform or move at a faster speed.

  9. Artweaver - Wikipedia

    en.wikipedia.org/wiki/Artweaver

    It also offers effect filters like sharpen, blur, emboss, and mosaic, as well as transparency and layer support in its own AWD format. Artweaver supports most common file formats, such as BMP , GIF , JPEG , PCX , TGA , TIFF , PNG , PSD , although the BMP, GIF, JPEG, and PNG formats do not have layer support.

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