| | <<<Back 1 day (to 2019/07/04) | Fwd 1 day (to 2019/07/06) >>> | 20190705 |
| bodqhrohro_ | By the way, why does running a second pass reduced PDF size from 18 MBs to 11.5 MBs? Looks like the order of parameters actually matters somehow. | 15:59.44 |
| kens | order of parameters does matter | 16:00.09 |
| bodqhrohro_ | Though it does not help with the downsampling issue. I thought it can be related to the stage on which grayscale images become monochrome (downsampling happens earlier), but after the second pass they are still not downsampled. | 16:02.55 |
| kens | grayscale images don'become monochrome | 16:03.26 |
| bodqhrohro_ | kens: so why do they become ccitt-encoded? | 16:05.22 |
| kens | if they start as monochrome | 16:05.41 |
| bodqhrohro_ | Actually, I don't know if pdfimages make difference between grayscale and monochrome images; it prints that all of them are grayscale. | 16:06.50 |
| | And identify prints that about the original PNG files too. | 16:07.14 |
| | kens: anyway, if they are even initially monochrome, shouldn't -dDownsampleMonoImages=true -dMonoImageResolution=300 -dMonoImageDownsampleThreshold=1.0 handle this? | 16:09.20 |
| kens | handle what ? | 16:09.34 |
| bodqhrohro_ | kens: downsampling all of monochrome images to 300 DPI | 16:09.54 |
| kens | it does | 16:10.07 |
| | Its currently 17:10 on a Friday afternoon. I'd suggest that if you have a question you post an example file and command line and I'll look at it tomorrow | 16:11.16 |
| bodqhrohro_ | kens: while preparing an MWE, I came to the clarification of the problem. Monochrome images seem to be downscaled only in integer number of times, that's why they are not downscaled if PPI is only a bit large than 300. Probably something specific to /Subsample filter? | 16:28.55 |
| kens | you can only use subsample with monochrome | 16:29.41 |
| | if you use anything else it becomes grayscale | 16:29.57 |
| bodqhrohro_ | kens: gs doesn't even permit me to do this: "The only Downsample filter for monochrome images is Subsample, ignoring request." | 16:32.53 |
| kens | yes | 16:33.08 |
| bodqhrohro_ | kens: so the documentation is wrong about the default MonoImageDownsampleType=/Bicubic in /prepress preset? I tested it and got the same behaviour as with /printer. | 16:41.37 |
| kens | then its the docsthat are wrong | 16:42.07 |
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