Images coming out darker then source.


I load a bitmap and write text to it and output to a 100 quality Jpeg or a bitmap as well and all the colors seem to be darker / faded.
I dont have a clue why this is happening? Any suggestions?
I have tried setting the useEnbeddedColorManagement to true. NO idea what this effects but it doesnt help my problem.
<code>
System.Drawing.Image b = System.Drawing.Bitmap.FromFile("myimage.bmp"), true);
System.Drawing.Graphics g = Graphics.FromImage(b);
//write text here
ContentType = "image/jpeg";
b.Save(Response.Output, myImageCodecInfo, myEncoderParameters);
//b.Save("C:\\inetpub\\wwwroot\\alcv4\\blah.jpg", ImageFormat.Jpeg);
g.Dispose();
b.Dispose();
Arr! We be DOS pirates!
0
cwiddy
1/21/2004 6:02:02 PM
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Two things to note here.

1) You're converting a bmp to a jpg. JPEG files are lossy - they're a lot smaller than BMPs, at the cost of some image quality. If you want bigger, but better quality, JPEGs, you need to . The difference is quality is especially visible if the bitmap contains line art, instead of a photo. This article by Dino Esposito explains how to save a JPEG with a better quality (and lower compression ratio)
2) When JPEGs are rendered, the image data must be converted to pixel values. Each browser or image viewer has its own algorithm for how this is done, and each has a different algorithm for correcting brightness (gamma). In observations, IE tends to render images a bit darker than other image viewers. BMPs, of course, are stored using pixel values and are thus (usually) the same on all viewers on a single monitor.
Shanku Niyogi





This posting is provided "AS IS" with no warranties, and confers no rights.
0
shankun
1/22/2004 6:14:07 AM
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