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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...

    First make sure your image has an alpha channel. Duplicate the original layer, but make it invisible. If the background should not be transparent when you are finished, create another new layer, and choose "Alpha to Selection" from the layer menu. Deselect any part that is supposed to remain transparent, and then shrink the selection by one.

  3. Transparency (graphic) - Wikipedia

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

    The edges of characters and other images with transparent background should not have shades of gray: these are normally used for intermediate colors between the color of the letter/image and that of the background, typically shades of gray being intermediate between a black letter and a white background. However, with, for example, a red ...

  4. Alpha compositing - Wikipedia

    en.wikipedia.org/wiki/Alpha_compositing

    In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. [1] It is often useful to render picture elements (pixels) in separate passes or layers and then combine the resulting 2D images into a single, final image called the composite .

  5. Blend modes - Wikipedia

    en.wikipedia.org/wiki/Blend_modes

    The Photoshop and illusions.hu flavors also produce the same result when the top layer is pure white (the differences between these two are in how one interpolates between these 3 results). These three results coincide with gamma correction of the bottom layer with γ=2 (for top black), unchanged bottom layer (or, what is the same, γ=1; for ...

  6. Wikipedia:Basic bitmap image editing - Wikipedia

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

    Adobe Photoshop: The best in the business, it has lots of plug-ins, is used by professionals, but is relatively expensive, though sometimes older versions can be found for less. GIMP : The GNU Image Manipulation Program is a popular open source software available for Linux , Windows , and macOS .

  7. 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.

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  9. Layers (digital image editing) - Wikipedia

    en.wikipedia.org/wiki/Layers_(digital_image_editing)

    Layers were introduced in Western markets by Fauve Matisse (later Macromedia xRes), [2] [better source needed] and then available in Adobe Photoshop 3.0, in 1994, which lead to wide-spread adoption. In vector image editors that support animation, layers are used to further enable manipulation along a common timeline for the animation; in SVG ...