It's not greyscale per se that is bad w/ rle encoding, it's dithered images. There are other color-reduction algorithms that may work better with compression than dithering does. Check to see if the paint program you are using to convert the images has some options.
-- -Richard M. Hartman [EMAIL PROTECTED] 186,000 mi/sec: not just a good idea, it's the LAW! Kijang Jung wrote in message <[EMAIL PROTECTED]>... > >I'm dealing with grayscale images dithered from 256-color, or true color >images. >In this case, Scanline and RLE are both NOT good to compress grayscales. So >now I'm implementing LZW to compress grayscale images. LZW can compress >grayscale image to about its half size. >I already tested Scanline coding which is supported by PalmOS, especially by >'WinDrawBitmap() function. (so that it's very convenient to display the >bitmap compressed with scanline coding.) >If you need the scanline coding, let me know that. I will send you my code.. > >Kijang Jung >SolidStreaming Inc. > >"Bob Whiteman" <[EMAIL PROTECTED]> wrote in message >news:[EMAIL PROTECTED] >> >> Application compression in the OS, huh? Is the decompression algorithm >> exposed anywhere? What algorithm is used? >> >> Also out of curiosity, bitmaps can be compressed using scan line >compression >> or run length compression. RLE is a pretty standard compression algorithm, >> but what is scan line compression? (I'd like to decide which compression >> will be better for the images in my resources, but I'd rather not have to >> make that decision by trying it out on every image. Knowing the >compression >> algorithm would help.) >> >> Thanks in advance, >> -Bob Whiteman >> >> > -----Original Message----- >> > From: David Fedor [mailto:[EMAIL PROTECTED] >> > Sent: Friday, September 08, 2000 4:06 PM >> > To: Palm Developer Forum >> > Subject: Re: m100 EFIGS oddness >> [...]As for Security: ROM space was very tight and so they had to keep >that >> > application compressed in ROM, and the appropriate language of it gets >> > decompressed and installed in RAM once you've chosen your language. >> > Having 5 languages all available takes a good deal of memory, and >> > there wasn't quite enough without the Welcome app doing a little >> > compression on the Security app. >> > >> > -David Fedor >> > Palm Developer Support >> >> > > > > -- For information on using the ACCESS Developer Forums, or to unsubscribe, please see http://www.access-company.com/developers/forums/
