[JAVA2D] grayscale rendering?

[Fred Stevens]

This isn't strictly a Java2D question, but I thought someone here might know the answer ...   I'm drawing grayscale images into an offscreen BufferedImage and then using drawImage to display them in the paint (or paintComponent) event.  I set the FORCEGRAYS environment variable to ensure the maximum number of grays in the palette.  I find that if I use a buffered image created as follows     m_image = new java.awt.image.BufferedImage(xDim,yDim,java.awt.image.BufferedImage.TYPE_BYTE_INDEXED,m_icm);   performance is awful, but I get a gray ramp which makes use of all the available grays.  When I create the BufferedImage as follows   m_image = new java.awt.image.BufferedImage(xDim,yDim,java.awt.image.BufferedImage.TYPE_BYTE_GRAY);   performance is better by a factor of almost 4, but the ramp is streaky, since not all the available grays are used.   Here's the machine configuration   WinNT v4 sp4 java version "1.3.0rc2" Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.0rc2-Y) Java HotSpot(TM) Client VM (build 1.3.0rc2-Y, mixed mode) 8-bit framebuffer FORCEGRAYS=Y   Thanks for any suggestions, Fred   --- J F Stevens [EMAIL PROTECTED] (sic) 610/407-4476 (voice) 425/871-0808 (FAX)