| Contrast Effect | ||
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The Contrast effect can be used to increase or decrease the contrast of an image.
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Settings
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Workings
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The value given is used to stretch the contrast within the image. Values greater than zero increase the amount of contrast while those less than zero decrease the contrast.
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Example
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The following show the effect of increasing and decreasing contrast.
void function() {
using (Doc doc = new Doc()) {
AddImagePage(doc, img2); // original image
doc.Rendering.Save("EffectContrast.jpg");
using (ImageLayer layer = AddImagePage(doc, img2)) {
using (EffectOperation effect = new EffectOperation("Contrast")) {
effect.Parameters["Amount"].Value = 25;
effect.Apply(layer.PixMap);
}
}
doc.Rendering.Save("EffectContrast25.jpg");
using (ImageLayer layer = AddImagePage(doc, img2)) {
using (EffectOperation effect = new EffectOperation("Contrast")) {
effect.Parameters["Amount"].Value = 50;
effect.Apply(layer.PixMap);
}
}
doc.Rendering.Save("EffectContrast50.jpg");
using (ImageLayer layer = AddImagePage(doc, img2)) {
using (EffectOperation effect = new EffectOperation("Contrast")) {
effect.Parameters["Amount"].Value = -50;
effect.Apply(layer.PixMap);
}
}
doc.Rendering.Save("EffectContrast-50.jpg");
}
}
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