Convert image format from .bmp to other image formats in vb.net

Question

How do you convert a System.Drawing.Bitmap image to another type of image? I tried CType, which failed, since I do not know the type for .png or .jpg. I cannot find it anywhere on google either.

What is the most efficient method to do this while keeping the quality of the image as high as possible?

Answer 1

The system.Drawing.Bitmap class can handle opening and saving any kind of bitmap image, including JPG, PNG, GIF, BMP, and others.

To save an already opened file as a different format you can use the save method as so

MyImage.Save("ImageName.jpg",System.Drawing.Imaging.ImageFormat.Jpeg)

The class name of Bitmp refers more specifically to the general concept of storing a picture as a series of coloured pixels rather then the actual format of BMP, which is one possible way to store the representation of the pixels that make up an image.

Answer 2

Check out the Drawing.Bitmap.Save() method. I recommend saving as PNG - it's lossless and achieves reasonable compression. See the Imaging.ImageFormat enum - this is how you specify the image type you want.