fastest image writing

Performance Tuning
#1

ImageIO.write is dangerously slow and I guess that’s because it’s compressing the image to another format.

So how do I go about doing this, when size isn’t a factor?

The fastest method of writing an image. Do I grab all pixels and write them?

#2

TGA

it’s basically a header + dump of the pixels

#3

Is there a faster way of getting all the pixels or do I just have to use

BufferedImage img = region.images[i];
int[] ARGB = new int[w * h];
img.getRGB(0, 0, w, h, ARGB, 0, w);

is there a way to avoid the integer array all together and write info directly to a byte array?

#4

about a zillion times faster:


   public static int[] accessRasterIntArray(BufferedImage src)
   {
      return ((DataBufferInt) src.getRaster().getDataBuffer()).getData();
   }

   public static byte[] accessRasterByteArray(BufferedImage src)
   {
      return ((DataBufferByte) src.getRaster().getDataBuffer()).getData();
   }
#5 
public static byte[] accessRasterByteArray(BufferedImage src)
{
   return ((DataBufferByte) src.getRaster().getDataBuffer()).getData();
}

I think that was exactly what I was looking for :wink:

thanks

#6

btw: you can use BufferedImage().getType() to pick the correct backing DataBuffer

#7

EDIT: Alright everything’s working