adjust brightness

Hello, here is my solution for changing brightness value of pixels inside image.

There are faster methods , read something about it at this url:

https://www.codeproject.com/Articles/990093/Image-Processing-for-Dummies-with-C-and-GDI-Part

//
//
//
Bitmap Change_Brightness(Bitmap Image, float brightness_value)
{
//
// This method changes value
// of pixel brigthness inside
// passed bitmap image
//
//
// Notice :
//
// Image format must be
// JPEG or BMP standard 24 bits RGB format
//
// brighteness_value variable value range
// goes from 0 (dark) up to 1 (bright)
//
//
// For...Next..Loop trough out all pixels inside image
//
for(int x=0;x
{
for(int y=0;y
{
//
// skip white pixels
//
if(
Image.GetPixel(x,y).R != (byte)255 ||
Image.GetPixel(x,y).G != (byte)255 ||
Image.GetPixel(x,y).B != (byte)255
)
// set new brightness value
Image.SetPixel(
x,
y,
Color.FromArgb(
(byte)(Image.GetPixel(x,y).R * brightness_value),
(byte)(Image.GetPixel(x,y).G * brightness_value),
(byte)(Image.GetPixel(x,y).B * brightness_value)
)
);
}
}
//
// Return changed image
//
return Image;
}
//
//
//

All the best,

Željko Peric

1 Reply

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Željko Perić8y ago
Accepted answer
Hello, here is my solution for changing brightness value of pixels inside image.
There are faster methods , read something about it at this url:
https://www.codeproject.com/Articles/990093/Image-Processing-for-Dummies-with-C-and-GDI-Part
//
//
//
Bitmap Change_Brightness(Bitmap Image, float brightness_value)
{
    //
    // This method changes value
    // of pixel brigthness inside
    // passed bitmap image
    //

    //
    // Notice :
    //
    // Image format must be
    // JPEG or BMP standard 24 bits RGB format
    //
    // brighteness_value variable value range
    // goes from 0 (dark) up to 1 (bright)
    //

    //
    // For...Next..Loop trough out all pixels inside image
    //
    for(int x=0;x
    {
        for(int y=0;y
        {
            //
            // skip white pixels
            //
            if(
                Image.GetPixel(x,y).R != (byte)255 ||
                Image.GetPixel(x,y).G != (byte)255 ||
                Image.GetPixel(x,y).B != (byte)255
            )
                // set new brightness value
                Image.SetPixel(
                    x,
                    y,
                    Color.FromArgb(
                        (byte)(Image.GetPixel(x,y).R * brightness_value),
                        (byte)(Image.GetPixel(x,y).G * brightness_value),
                        (byte)(Image.GetPixel(x,y).B * brightness_value)
                    )
                );
        }
    }
    //
    // Return changed image
    //
    return Image;
}
//
//
//
All the best,
Željko Peric
0