05-04-2020, 04:58 PM | #1 |
Wizard
Posts: 1,814
Karma: 13416550
Join Date: Nov 2010
Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro
|
Image Quality Degraded (AZW3-->KEPUB)
I have recently ordered a Kobo Clara HD, so I've been liberating and converting a number of my Amazon books in preparation. When reviewing one book, I noticed that some of the graphics were significantly degraded, for example:
https://imgur.com/a/C0ys3cO It looks like the image might have been re-encoded, and the lossy compression either added artifacts, or has a higher compression setting. Are there any settings that I can modify to improve this? The cover doesn't seem to have suffered the same fate, just the in-book image(s). EDIT: I've tried the tablet and HD eInk page layout profiles, neither helped. Last edited by twowheels; 05-04-2020 at 05:22 PM. |
05-04-2020, 05:28 PM | #2 |
Wizard
Posts: 1,814
Karma: 13416550
Join Date: Nov 2010
Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro
|
Figured it out -- going to keep my post and add an answer in case others search and find this. My prior searches were fruitless, so hopefully this'll be helpful to somebody.
Even though I changed my page layout profile in the preferences, the converter dialog wasn't updating the output profile. Changing it there (I used reset defaults button) fixed the image resolution issue. |
Advert | |
|
05-04-2020, 05:38 PM | #3 |
Running with scissors
Posts: 1,555
Karma: 14325282
Join Date: Nov 2019
Device: none
|
When you change the settings when converting a book it remembers it only for that book. You have to change the global ones in Preferences if you want the new changes to be used thereafter.
|
05-04-2020, 05:45 PM | #4 | |
Wizard
Posts: 1,814
Karma: 13416550
Join Date: Nov 2010
Device: Kobo Clara HD, iPad Pro 10", iPhone 15 Pro
|
Quote:
For some reason previous conversions had caused the setting to "stick" in the converter screens, even across multiple application restarts. It wasn't until I said "reset defaults" within the individual converter settings that it took effect. |
|
05-04-2020, 06:33 PM | #5 |
null operator (he/him)
Posts: 20,936
Karma: 27620688
Join Date: Mar 2012
Location: Sydney Australia
Device: none
|
This might explain why ==>> calibre User Manual: E-book conversion
Be good to have a has_conversion_options template function that could be used in setting a custom column if it was true, or in a column colouring or column icon rule. BR |
Advert | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
AZW3 Manga to KEPUB | RZetlin | Conversion | 16 | 08-05-2017 07:58 AM |
AZW3 thumbnail very pixelated/grainy/low quality | superminh21 | Amazon Kindle | 3 | 09-30-2016 10:17 AM |
Kepub image and viewer question | Hypernova | Kobo Reader | 1 | 11-21-2015 08:28 AM |
AZW3 to PDF images quality | dragoth | Conversion | 11 | 06-19-2015 02:38 PM |
degraded cover image in Nook for PC and ADE | SantafA | ePub | 8 | 03-24-2015 07:24 PM |