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.net Bitmap changes color of image


.net Bitmap changes color of image

By : user2953685
Date : November 21 2020, 01:01 AM
wish help you to fix your issue It is as Hans Passant says. I just had to add the true at Image.FromFile(filename, True)
This true stands for:
code :


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How apply Color Lut over bitmap image in c#

How apply Color Lut over bitmap image in c#


By : Norm Orstad
Date : March 29 2020, 07:55 AM
this one helps. i solved this problem see how. Somewhere i read that GDI+ return BGR value not the RGB. So i reverse the order and amazing everything fine. But it is little bit slow.
code :
       PixelFormat format = PixelFormat.Format8bppIndexed;
       Bitmap bmp = new Bitmap(Img_Width, Img_Height,format);

       Rectangle rect = new Rectangle(0, 0, Img_Width, Img_Height);

       //locking the bitmap on memory
       BitmapData bmpData = bmp.LockBits(rect, ImageLockMode.ReadWrite, format);
       Marshal.Copy(rawPixel, 0, bmpData.Scan0, rawPixel.Length);

       int stride = bmpData.Stride;
       System.IntPtr Scan0 = bmpData.Scan0;

       unsafe
       {
           byte* p = (byte*)(void*)Scan0;
           int nOffset = stride - bmp.Width * SAMPLES_PER_PIXEL ;
           byte red, green, blue;

           for (int y = 0; y < bmp.Height; ++y)
            {
                for (int x = 0; x < bmp.Width; ++x)
                {
                    blue = p[0];
                    green = p[1];
                    red = p[2];
                    p[0] = red;
                    p[1] = green;
                    p[2] = blue;
                    p += 3;
                }
                p += nOffset;
            }
        }

        ////unlockimg the bitmap
        bmp.UnlockBits(bmpData);
Set background color in Bitmap Image

Set background color in Bitmap Image


By : jamie craig
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further Try PixelFormats.Default or PixelFormats.Bgra32 or PixelFormats.Rgb24 instead of PixelFormats.Pbgra32.
The P stands for pre-multiplied - the assumption is that each channel is pre-multiplied by alpha.
How to set color representation for a bitmap image in wpf

How to set color representation for a bitmap image in wpf


By : sefihu
Date : March 29 2020, 07:55 AM
it helps some times Using this library you can manipulate the tags for Tiff files, one of which should be the colour you are after.
RGB color in 24 bitmap image and 16 bitmap image

RGB color in 24 bitmap image and 16 bitmap image


By : Sarvesh Yadav
Date : March 29 2020, 07:55 AM
should help you out Bitmaps can be tough to work with in source code to retrieve its data. You first have to parse the file for its header and from its header you have to parse it and its data to know what type of bitmap image you are working with. Bitmaps have a lot of information stored. Logically speaking if the bitmap image is 24bits without transparency values for specifically a RGB type you then need to know if the image is compressed and by what compression method as well as other properties of a the file such as palette information, icon information, etc. so you know where to find the actual pixel data within that specific file. After you extract the raw data you then need to know how the information is stored. Here is were it can get tricky: it might be a RGB image but the data could be stored in the file in a direct RGB order or it could be reversed BGR. After that then it is a matter of knowing which orientation the image data is stored and if you need to flip it vertically, horizontally or both. Other than that if the color data is in the correct order and the image is in the proper orientation without compression then it should be without a doubt structured as this for unsigned char values:
code :
// Considering data is in RGB order:
unsigned char colorData[3];      // Integer Base Range
colorData[0] = red byte          [0, 255]
colorData[1] = green byte        [0, 255]
colorData[2] = blue byte         [0, 255]
How to convert color image bitmap to black&white image bitmap in android?

How to convert color image bitmap to black&white image bitmap in android?


By : gab93
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , This question is long ago, but probably I could help other users. I also had a long search for creating (fast)a pure Black and White bitmap.
My first methode used bitmap.getPixel() and bitmap.setPixel() This took about 8s (832 x 1532) New Method took 0.4s! factor 20!
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