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Joined: 7/30/2017(UTC)
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I'm trying to apply a brightness and contrast to an image and I'm not sure if I'm doing it right. I already have an image loaded in a bitmap and from the sample code I saw where I have to create a new Brightness and Contrast object and then apply the values based on those objects. Here is my code: Code:
resizedBmp.Transforms.Resize(new Size(width, height), ResizeInterpolationMode.Medium, ResizeMode.ImageFill);
using (var brightness = new Brightness())
using (var contrast = new Contrast())
{
brightness.Auto = false;
brightness.Amount = 0.3f;
contrast.Auto = false;
contrast.Amount = 0.15f;
using (var brightnessBitmap = brightness.Apply(resizedBmp))
{
Aurigma.GraphicsMill.Bitmap finalBitmap = contrast.Apply(brightnessBitmap);
var jpegSettings = new Aurigma.GraphicsMill.Codecs.JpegSettings();
jpegSettings.Quality = 90;
jpegSettings.UseSubsampling = false;
jpegSettings.IsProgressive = true;
finalBitmap.Save(filename, jpegSettings);
finalBitmap.Dispose();
}
}
The issue I'm seeing is if I put in values of 0 for both Brightness and Contrast the image is looking washed out versus if I don't apply them at all. Edited by moderator Sunday, October 29, 2017 9:26:37 PM(UTC)
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Rank: Advanced Member
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Joined: 7/4/2017(UTC)
Posts: 43
Was thanked: 12 time(s) in 12 post(s)
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Hi, I believe the reason why output images are looking washing out is ResizeInterpolationMode.Medium. Please try Lanczos3 and compare results. I've testes this with 0 for Brightness and Contrast, and it works as expected. Also, you can use shorter code to apply brightness and contrast, like below: Code:resizedBmp.Transforms.Resize(new Size(width, height), ResizeInterpolationMode.Lanczos3, ResizeMode.ImageFill);
resizedBmp.ColorAdjustment.Brightness(0.3f);
resizedBmp.ColorAdjustment.Contrast(0.15f);
...
Regards, Andrew
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 1 user thanked Andrey Semenov for this useful post.
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