Graphics on indexed image

Question

I am getting error:

"A Graphics object cannot be created from an image that has an indexed pixel format."

in function:

public static void AdjustImage(ImageAttributes imageAttributes, Image image) {         Rectangle rect = new Rectangle(0, 0, image.Width, image.Height);          Graphics g = Graphics.FromImage(image);                g.InterpolationMode = InterpolationMode.HighQualityBicubic;         g.DrawImage(image, rect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, imageAttributes);         g.Dispose(); } 

I would like to ask you, how can I fix it?

Answer 1

Refering to this, it can be solved by creating a blank bitmap with the same dimensions and the correct PixelFormat and the draw on that bitmap.

// The original bitmap with the wrong pixel format.  // You can check the pixel format with originalBmp.PixelFormat Bitmap originalBmp = new (Bitmap)Image.FromFile("YourFileName.gif");  // Create a blank bitmap with the same dimensions Bitmap tempBitmap = new Bitmap(originalBmp.Width, originalBmp.Height);  // From this bitmap, the graphics can be obtained, because it has the right PixelFormat using(Graphics g = Graphics.FromImage(tempBitmap)) {     // Draw the original bitmap onto the graphics of the new bitmap     g.DrawImage(originalBmp, 0, 0);     // Use g to do whatever you like     g.DrawLine(...); }  // Use tempBitmap as you would have used originalBmp return tempBitmap; 

Answer 2

The simplest way is to create a new image like this:

Bitmap EditableImg = new Bitmap(IndexedImg); 

It creates a new image exactly like the original was with all its contents.