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Add a setting in preferences for exporting with or without alpha background (for image formats supporting alpha) 01/06/2011 1.9.1 (Mac App Store) 10.6.6 LiveQuartz 1.9.1 is the first release available on the Mac AppStore; Bug fixes; Free line tool has been removed has it did not differentiated enough with the brush. 2011 1.9.0.1 10.6
Image editors may feature a number of algorithms which can add or remove noise in an image. Some JPEG artifacts can be removed; dust and scratches can be removed and an image can be de-speckled. Noise reduction merely estimates the state of the scene without the noise and is not a substitute for obtaining a "cleaner" image.
Smoothing filters tend to blur an image because pixel intensity values that are significantly higher or lower than the surrounding neighborhood smear across the area. Because of this blurring, linear filters are seldom used in practice for noise reduction; [ citation needed ] they are, however, often used as the basis for nonlinear noise ...
The median filter is a non-linear digital filtering technique, often used to remove noise from an image, [1] signal, [2] and video. [3] Such noise reduction is a typical pre-processing step to improve the results of later processing (for example, edge detection on an image).
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The 256 available colors would be used to generate a dithered approximation of the original image. Without dithering, the colors in the original image would be quantized to the closest available color, resulting in a displayed image that is a poor representation of the original. The very earliest uses were to reduce images to 1-bit black and white.