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  2. Image editing - Wikipedia

    en.wikipedia.org/wiki/Image_editing

    Raster images are stored on a computer in the form of a grid of picture elements, or pixels. These pixels contain the image's color and brightness information. Image editors can change the pixels to enhance the image in many ways. The pixels can be changed as a group or individually by the sophisticated algorithms within the image editors.

  3. 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 ...

  4. Iridescence - Wikipedia

    en.wikipedia.org/wiki/Iridescence

    Iridescence (also known as goniochromism) is the phenomenon of certain surfaces that appear gradually to change colour as the angle of view or the angle of illumination changes. Iridescence is caused by wave interference of light in microstructures or thin films.

  5. Dots per inch - Wikipedia

    en.wikipedia.org/wiki/Dots_per_inch

    There are some ongoing efforts to abandon the DPI Image resolution unit in favour of a metric unit, giving the inter-dot spacing in dots per centimetre (px/cm or dpcm), as used in CSS3 media queries [13] or micrometres (μm) between dots. [14] A resolution of 72 DPI, for example, equals a resolution of about 28 dpcm or an inter-dot spacing of ...

  6. Image resolution - Wikipedia

    en.wikipedia.org/wiki/Image_resolution

    Image resolution is the level of detail of an image. The term applies to digital images, film images, and other types of images. "Higher resolution" means more image detail. Image resolution can be measured in various ways. Resolution quantifies how close lines can be to each other and still be visibly resolved. Resolution units can be tied to ...

  7. Gilding - Wikipedia

    en.wikipedia.org/wiki/Gilding

    Gilding gives an object a gold appearance at a fraction of the cost of creating a solid gold object. In addition, a solid gold piece would often be too soft or too heavy for practical use. A gilt surface also does not tarnish as silver does. Modern gilding is applied to numerous and diverse surfaces and by various processes.

  8. Depletion gilding - Wikipedia

    en.wikipedia.org/wiki/Depletion_gilding

    The result is a thin layer of nearly pure gold on the surface of the original object. There is no well-defined minimum gold content required to successfully depletion gild an object. However, the less gold that is present, the more other material must be etched away to produce the desired surface appearance.

  9. Grayscale - Wikipedia

    en.wikipedia.org/wiki/Grayscale

    To convert a color from a colorspace based on a typical gamma-compressed (nonlinear) RGB color model to a grayscale representation of its luminance, the gamma compression function must first be removed via gamma expansion (linearization) to transform the image to a linear RGB colorspace, so that the appropriate weighted sum can be applied to ...