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

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

    Deselect any part that is supposed to remain transparent, and then shrink the selection by one. Use the color picker and fill with the background color. Either way, use the color picker to select the foreground color (being sure sample an average) and select the background color with your favorite tool and press delete.

  3. Transparency (graphic) - Wikipedia

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

    This image has partial transparency (254 possible levels of transparency between fully transparent and fully opaque). It can be transparent against any background despite being anti-aliased. Some image formats, such as PNG and TIFF, also allow partial transparency through an alpha channel, which solves the edge limitation problem.

  4. 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 ...

  5. Chroma key - Wikipedia

    en.wikipedia.org/wiki/Chroma_key

    The technique has been used in many fields to remove a background from the subject of a photo or video – particularly the newscasting, motion picture, and video game industries. A colour range in the foreground footage is made transparent, allowing separately filmed background footage or a static image to be inserted into the scene.

  6. PNG - Wikipedia

    en.wikipedia.org/wiki/PNG

    Other image attributes that can be stored in PNG files include gamma values, background color, and textual metadata information. PNG also supports color management through the inclusion of ICC color profiles. [23] bKGD gives the default background color. It is intended for use when there is no better choice available, such as in standalone ...

  7. Wikipedia:Removal of non-free images - Wikipedia

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

    Yes, permission could be requested prior to the removal of the image. However, many editors don't make requests of users to remove such images because to do so would require the crafting of individual, unique messages in every case where an image is removed. This would be time consuming to say the least.

  8. Image editing - Wikipedia

    en.wikipedia.org/wiki/Image_editing

    The background image is used as the bottom layer, and the image with parts to be added are placed in a layer above that. Using an image layer mask , all but the parts to be merged is hidden from the layer, giving the impression that these parts have been added to the background layer.

  9. pngcrush - Wikipedia

    en.wikipedia.org/wiki/Pngcrush

    The main purpose of pngcrush is to reduce the size of the PNG IDAT data stream by trying various combinations of compression methods and delta filters. It can also be used for various manipulations of PNG images, such as changing the bit depth , removing unwanted ancillary chunks , or adding certain chunks including gAMA, tRNS, iCCP, and ...

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