On 31 Mar 2016, at 14:34, Olaf Drümmer <[email protected]> wrote:
>> On 31.03.2016, at 13:40, John Hewson <[email protected]> wrote: >> >>> >>> 2. What would be your suggestion for non-lossy compression for color images >>> in PDF files? I know LZW is an answer, but the compression is much worst >>> than JPEG2000. >> >> First of all I'd check if a maximum-quality JPEG isn't good enough. It >> usually is. If you really need lossless (and as you're archiving you might >> well do) then PNG is simple and reliable. There are ways to losslessly >> optimise the colour palette to reduce file size a bit. Also make sure you >> use the right colour space - a b&w raster is 1/3 the size of an RGB one. > > JPEG2000 also lets you do lossless compression. > > PNG does not have anything to do with PDF. I'm using PNG as a shorthand for Flate + Predictor which is the same compression that PNG uses - though you're quite right that it's not actually a PNG file. -- John > Olaf > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [email protected] > For additional commands, e-mail: [email protected] > --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
