tutorial photopaint
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33) How to blur the edges of images
1. Uniform fill image

in this case, we can add some of the filters that we find in Effect/Blur as:
Gaussian blur: it works on entire image, at its lower settings gives an image a slightly out of focus look, while at higher settings it can make the image into fog;
if we use it when a mask of image is active, it works into the edges of the image and give a particular blur;
smooth filter: it tones down difference in adjacent pixels and get a light loss of image' s details, the result is quite the same of the
soften filter: it smoothes and tones down hardness without losin detail (only in theoretically);
note: never use these filters with Transparency Block button On, because, in this case, they cannot work;
below: 1. original image, no filter, 2. smooth filter once, 3. smooth filter three times;
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how we can see below, if we add the same filter to a bitmap fill image, the whole image becomes blur:
below: 1. original image, no filter, 2. smooth filter once, 3. smooth filter three times;
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below: 1. original image, no filter, 2. soften filter once, 3. soften filter three times;
(also soften filter deletes many details)
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2. Bitmap fill image

to obtain a soften edge without blur the entire image we can:
add a mask to image;
apply a mask inside feather very high (in example 30 pixels) to obtain a graduate transition from edges to the centre of the image;
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invert the mask (we want blur the edges, not its centre);
add a Gaussian blur (in this case radius = 5 pixels);
in the last image we can see the final effect.
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changing the feather value, we can obtain different levels of blur.
icosu
italiano
indietroindiceavanti