k2pdfopt: optimizes PDFs for viewing on e-readers - Page 127

Tex2002ans · 09-09-2021, 11:15 PM

Quote:

Originally Posted by willus

These hyphens are a bit "stubby" and also tilted somewhat, which is odd.

"Slanted Hyphens" are a thing, depending on the font. Going from horizontal/flat (what we all know now), to very tilted up:

Graphic Design (Stack Exchange): "Where and/or why is a slanted hyphen used?"

There's also the "Double Hyphen" which looks like an equals sign:

Wikipedia.org: "Double Hyphen"

Quote:

Originally Posted by willus

FYI the current detection algorithm is looking at the graphic, not the characters. It is looking for the "shape" of a hyphen.

Fascinating stuff. Still don't know how it works its magic with the PDFs, but it works!

ash2017 · 09-11-2021, 02:32 AM

Hello @willus, I just like to thank you for your hard work and contribution.
This is an amazing piece of software and I am extremely grateful for this.

willus · 09-15-2021, 09:55 PM

Thank you, ash2017 and Tex2002ans, for the nice comments.

VladimirS · 09-23-2021, 10:54 AM

I am just thinking...

How one physical problem and discomfort (having small screen reading device)
led to creation of such great, usefull and productive little piece of software !

Thank you again Mr. Willus for K2PDFOPT!

treslineas · 09-26-2021, 04:10 PM

Willus, Word still messes up equations and mathematical formulas in PDF conversion, using your application is better in case you're looking for math textbooks. Since (I assume) it cuts up the pdf into images, it doesn't mess the formulas.

Thank you for your work, it's magic to me.

willus · 09-27-2021, 08:46 PM

Quote:

Originally Posted by treslineas

Willus, Word still messes up equations and mathematical formulas in PDF conversion, using your application is better in case you're looking for math textbooks. Since (I assume) it cuts up the pdf into images, it doesn't mess the formulas.

Thank you for your work, it's magic to me.

Thanks. It certainly depends up on the specific case and what you want out of the conversion. It's always good to have options.

divdev · 10-01-2021, 03:12 PM

I'd like to add another motion of gratitude to this thread. I tried the Word method to making a particular PDF book readable on my 6" Kobo Clara and it failed terribly. This tool effortlessly did an amazing job!

Shohreh · 10-07-2021, 07:40 AM

Noticed a small bug (in 2.53 at least): When adding an EPUB by mistake, the app closes without further ado, instead of just ignoring non-PDFs with a dialog box ("k2pdfopt only handles PDF files.").

georgeandrew · 10-19-2021, 06:29 PM

Hi willus,

Thank you for the great tool!
I was trying to compile the k2pdfopt v2.53 in Msys2 MinGW64 but I am very new to CMake and programming in Linux(-like) system. I have installed all the other dependent libs to /mingw64/ and, also compiled mupdf and installed it to /usr/local/include/mupdf for *.h files and /usr/local/lib since there seems no directly available mupdf package. when I was using vscode it told me that
----------------------------------

Code:

[cmake] -- Checking for module 'mupdf'
[cmake] --   Package 'mupdf', required by 'virtual:world', not found

----------------------------------
and then if I right-click on 'CMakeLists.txt' and select 'build all projects', vs code will give me quite a few errors, such like:
--------------

Code:

[build] C:/k2pdfopt_v2.53/k2pdfoptlib/k2ocr.c:760:13: error: static declaration of 'k2ocr_ocrwords_get_from_ocrlayer' follows non-static declaration
[build] C:/k2pdfopt_v2.53/k2pdfoptlib/k2ocr.c:607:9: note: previous implicit declaration of 'k2ocr_ocrwords_get_from_ocrlayer' was here

------------------------------------------
Do you have any suggestions on what I shall do?
instead--I know it's a greedy wish--but is it possible you could add more instructions into your readme_k2src.txt file for new people, if possible? I think this will be even greater.

Thanks a lot!

willus · 10-26-2021, 09:49 PM

Quote:

Originally Posted by georgeandrew

I was trying to compile the k2pdfopt v2.53 in Msys2 MinGW64 but I am very new to CMake and programming ...

Hi--sorry for the delay in responding. I'm just curious, why are you trying to compile k2pdfopt in MSYS2? Why not just build it in Windows using a MinGW gcc compiler per my source code instructions. Don't Windows binaries run okay in MSYS2?

willus · 10-26-2021, 09:51 PM

Quote:

Originally Posted by Shohreh

Noticed a small bug (in 2.53 at least): When adding an EPUB by mistake, the app closes without further ado, instead of just ignoring non-PDFs with a dialog box ("k2pdfopt only handles PDF files.").

Added to my bug list. Thanks.

avantman42 · 12-06-2021, 06:22 AM

I've just discovered this tool, and it looks like it might be useful for converting RPG PDFs for use on my ereaders.

I have a request, though. Would it be possible to add an option to output just text, rather than images with text?

willus · 12-06-2021, 11:25 PM

To just show text--did you try the -ocrvis t option?

avantman42 · 12-07-2021, 06:00 AM

Quote:

Originally Posted by willus

To just show text--did you try the -ocrvis t option?

I hadn't, but I have now

That, and -mode 2col are ideal for what I want. Thank you.

I'll RTFM next time

Shohreh · 12-11-2021, 04:18 PM

I just gave k2pdfopt a try to recompress a PDF that I edited after decompressing it (from 13MB to 650MB.)

Using the following…

Code:

k2pdfopt.exe input.pdf -fc- -mode copy -dpi 200 -o output.pdf

… it turns the 650MB edited file into 10MB file, which is super nice, but I notice the colors are wrong:

What setting could I try?

Thank you.

--
Edit: Never mind, GhostScript did the job.

09-26-2021, 04:10 PM	#1895
treslineas Junior Member Posts: 2 Karma: 49666 Join Date: Sep 2021 Device: Kindle 7	k2pdfopt better than Word Willus, Word still messes up equations and mathematical formulas in PDF conversion, using your application is better in case you're looking for math textbooks. Since (I assume) it cuts up the pdf into images, it doesn't mess the formulas. Thank you for your work, it's magic to me.

10-19-2021, 06:29 PM	#1899
georgeandrew Junior Member Posts: 1 Karma: 10 Join Date: Oct 2021 Device: kindle	compile k2pdfopt Hi willus, Thank you for the great tool! I was trying to compile the k2pdfopt v2.53 in Msys2 MinGW64 but I am very new to CMake and programming in Linux(-like) system. I have installed all the other dependent libs to /mingw64/ and, also compiled mupdf and installed it to /usr/local/include/mupdf for *.h files and /usr/local/lib since there seems no directly available mupdf package. when I was using vscode it told me that ---------------------------------- Code: [cmake] -- Checking for module 'mupdf' [cmake] -- Package 'mupdf', required by 'virtual:world', not found ---------------------------------- and then if I right-click on 'CMakeLists.txt' and select 'build all projects', vs code will give me quite a few errors, such like: -------------- Code: [build] C:/k2pdfopt_v2.53/k2pdfoptlib/k2ocr.c:760:13: error: static declaration of 'k2ocr_ocrwords_get_from_ocrlayer' follows non-static declaration [build] C:/k2pdfopt_v2.53/k2pdfoptlib/k2ocr.c:607:9: note: previous implicit declaration of 'k2ocr_ocrwords_get_from_ocrlayer' was here ------------------------------------------ Do you have any suggestions on what I shall do? instead--I know it's a greedy wish--but is it possible you could add more instructions into your readme_k2src.txt file for new people, if possible? I think this will be even greater. Thanks a lot!

12-11-2021, 04:18 PM	#1905
Shohreh Zealot Posts: 148 Karma: 192898 Join Date: Jan 2016 Device: none	I just gave k2pdfopt a try to recompress a PDF that I edited after decompressing it (from 13MB to 650MB.) Using the following… Code: k2pdfopt.exe input.pdf -fc- -mode copy -dpi 200 -o output.pdf … it turns the 650MB edited file into 10MB file, which is super nice, but I notice the colors are wrong: What setting could I try? Thank you. -- Edit: Never mind, GhostScript did the job. Last edited by Shohreh; 12-11-2021 at 05:31 PM.

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09-11-2021, 02:32 AM	#1892
ash2017 Member Posts: 15 Karma: 49874 Join Date: May 2017 Device: Kindle Paperwhite	Hello @willus, I just like to thank you for your hard work and contribution. This is an amazing piece of software and I am extremely grateful for this.

09-15-2021, 09:55 PM	#1893
willus Fuzzball, the purple cat Posts: 1,272 Karma: 11087488 Join Date: Jun 2011 Location: California Device: iPad	Thank you, ash2017 and Tex2002ans, for the nice comments.

09-23-2021, 10:54 AM	#1894
VladimirS Connoisseur Posts: 63 Karma: 302424 Join Date: Aug 2019 Location: Serbia, former Yugoslavia Device: Pocketbook InkPad 3	I am just thinking... How one physical problem and discomfort (having small screen reading device) led to creation of such great, usefull and productive little piece of software ! Thank you again Mr. Willus for K2PDFOPT!

10-01-2021, 03:12 PM	#1897
divdev Junior Member Posts: 2 Karma: 49666 Join Date: Sep 2021 Device: Kobo Clara HD	I'd like to add another motion of gratitude to this thread. I tried the Word method to making a particular PDF book readable on my 6" Kobo Clara and it failed terribly. This tool effortlessly did an amazing job!

10-07-2021, 07:40 AM	#1898
Shohreh Zealot Posts: 148 Karma: 192898 Join Date: Jan 2016 Device: none	Noticed a small bug (in 2.53 at least): When adding an EPUB by mistake, the app closes without further ado, instead of just ignoring non-PDFs with a dialog box ("k2pdfopt only handles PDF files.").

12-06-2021, 06:22 AM	#1902
avantman42 Wizard Posts: 1,090 Karma: 6058305 Join Date: Sep 2010 Location: UK Device: Kindle Paperwhite	I've just discovered this tool, and it looks like it might be useful for converting RPG PDFs for use on my ereaders. I have a request, though. Would it be possible to add an option to output just text, rather than images with text?

12-06-2021, 11:25 PM	#1903
willus Fuzzball, the purple cat Posts: 1,272 Karma: 11087488 Join Date: Jun 2011 Location: California Device: iPad	To just show text--did you try the -ocrvis t option?