![]() |
#1 |
Junior Member
![]() Posts: 2
Karma: 10
Join Date: Apr 2020
Device: None
|
How to not compress jpeg
I'm writing a handbook in photography, of course it will have lots of pictures which need high quality.
A draft is now formated in Sigil with HTML and the pictures are in the book. Unfortunately, the pictures had bad quality when I for he first time looked in the book with an ebook reader app. I checked the size of the epub-file which was one fifth of all the pictures together. Is there a setting to prevent Sigil from compressing the pictures? If not, are there any alternatives? |
![]() |
![]() |
![]() |
#2 |
Sigil Developer
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 8,019
Karma: 5449552
Join Date: Nov 2009
Device: many
|
Sigil does not compress or process (lossy or lossless) images in any way. Perhaps you used calibre to create your ebook?
|
![]() |
![]() |
![]() |
#3 |
Resident Curmudgeon
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 75,688
Karma: 134319572
Join Date: Nov 2006
Location: Roslindale, Massachusetts
Device: Kobo Libra 2, Kobo Aura H2O, PRS-650, PRS-T1, nook STR, PW3
|
If you are using Adobe Digital Editions to check your eBook, that could be your problem with the graphics. ADE does a poor job of displaying images. Try using the Calibre viewer or some other program to view your eBook.
|
![]() |
![]() |
![]() |
#4 |
Sigil Developer
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 8,019
Karma: 5449552
Join Date: Nov 2009
Device: many
|
An epub is by definition a zip archive. But that compression is lossless and is used on all files but the mimetype file. Lossless epub compression can not and does not impact image quality and as I said earlier Sigil does not process any images files in any way.
Perhaps your e-reader has a limitation? |
![]() |
![]() |
![]() |
#5 |
Wizard
![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() ![]() Posts: 2,297
Karma: 12126329
Join Date: Jul 2012
Device: Kobo Forma, Nook
|
Did you use some other program (Word/InDesign) to create the HTML?
What usually happens is the defaults in those programs are set to export low quality JPGs ("96 DPI") instead of the original images. |
![]() |
![]() |
![]() |
#6 |
Junior Member
![]() Posts: 2
Karma: 10
Join Date: Apr 2020
Device: None
|
Thanks for quick replies. The problem was the app I used to read the book. Fullreader was terrible for pictures, but Pocketbook was much better.
|
![]() |
![]() |
![]() |
#7 |
Junior Member
![]() Posts: 5
Karma: 10
Join Date: May 2024
Location: India
Device: none
|
Fullreader was bad for pictures, but switching to Pocketbook improved the image quality.
|
![]() |
![]() |
![]() |
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
Batch mode to compress images | pmichelazzo | Editor | 2 | 06-17-2018 04:33 AM |
Compress Financial Times Recipe | duhduhduh | Recipes | 1 | 04-02-2017 09:40 AM |
No glyph available error and cannot compress png images | crouton | Editor | 1 | 01-06-2017 10:02 PM |
Compress Data Base error on GloHD | mconh | Devices | 3 | 11-09-2015 05:53 PM |
Can Calibre compress ePub? | marty1990 | Calibre | 2 | 06-09-2012 06:52 AM |