Thread: k2pdfopt: optimizes PDFs for viewing on e-readers
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Old 02-18-2015, 10:49 PM   #1005
wdq4587
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Join Date: Feb 2015
Device: kpw2
Quote:
Originally Posted by willus View Post
I guess I'm still not understanding you. If you are using native PDF output, any issues with scale factors being pixel-for-pixel with your display, or with file size or lossless images, become moot. With native PDF output, k2pdfopt just reassembles the source using cropping, rotation, and translation. It does not have any further control over losslessness or file size. It leaves the source PDF's internal bitmap encoding or resolutions completely unchanged.
Let me explain:

First is I want export k2pdfopt processed PDF file to images and then convert to mobi file. Then I found I can not let even the native PDF output render pixel-for-pixel image result because the transformation matrix not equal to (1 0 0 1 x y). May be I can adjust let it look like 1.001 but not exactly to 1. That will cause pixel resampling while rending the page.

I know if I view the native PDF mode processed PDF in kindle directly, it will only scale once to screen. But in this situation I mean convert to other file format, extract images form the PDF file will not help, I need render the pages to get the split page and merge page result.

Secondary I also want in text reflow mode can has a option pixel-for-pixel, so the result filesize will not increase. I know there are some limitation, for example can not use Autostraighteen and so may be cause bad result.

But in other meaning, if the output file resolution not match the read device best resolution, the read device will do scale. And since the text reflow process have scaled once, then when reader view it will scale twice. I think scale twice can not have better quality then only scale once by read device, even it use bilinear interpolation and text reflow process use some advanced algorithm like bicubic.

Only way can get better quality now is not let the read device scale, only the text reflow process scale. That need output resolution just match the read device best display resolution which I don't know exactly. And this resolution will also change if some user using landscape mode and others using portrait mode.

My test file here: http://pan.baidu.com/s/1jGtGXpW password: 1h91

BTW, I also suggest add using percent option in GUI for -m option.
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