kindle azw to PocektBook epub images too small

[richo]

I am converting book bought from amazon to epub so I can read it on my PocektBook InkPad2 with much higher resolution screen. My Kindle is Paperwhite. InkPad 2 has screen 1200x1600px.

Images look good when open in book view of calibre on notebook. Once open in InkPad they are very small. The calibre styles styling the img has set fixed size in px to same size as images.

In conversion preferences of calibre I had set input Kindle, output NookHD+ (which has similar pixel size.

Is there anything I did wrong or I can do better?

Thanks

[theducks]

Set your profile to Tablet.
The profile mostly sets Image size these days.
Note use the conversion button/tick to forget the previous conversion settings used on THAT book

[richo]

@theducks, by the profile you mean the output profile for conversion? I set that manual for this manual conversion, input profile kindle output tablet.

Not sure what tick you mean for not remembering previous setting used for this book. I think as I did changes (the above profile selection) in the process of conversion (not in profiles for all conversions) it is not relevant for the moment.


Still no change, the CSS, used styles are all same and images stayed same when viewing in PocketBook.

Did I did something wrong again?
Thank you for you rsuggestions.

[theducks]

If you make a setting change in Preferences: conversions, it does not change any previously converted books (they remember what was used THEN).

There is a tick/button to make it re-read preferences (the default)
You can also override the default on a per/conversion via the conversion screen

[richo]

Originally Posted by theducks

You can also override the default on a per/conversion via the conversion screen

That is exactly what I did, it didn't help, however results is exactly the same.
Which part of preferences in calibre conversion influence the image sizes?

[richo]

To give more information. Whatever I do the size of images is always same, good looking at viewer of calibre itself, but very small in PocektBook 1200x1600 pixel display.

Image size in pixels is 402x220px.
This is relevant part of html in book as displayed by calibre in resulted epub:
All this never change doesn't matter what input output profile I choose during conversion. I must be doing some trivial mistake here.

<p class="image1"><img src="../images/00008.jpeg" alt="image" class="calibre12"/></p>

where

.image1 {
display: block;
line-height: 1.2;
margin-bottom: 2em;
margin-left: 0;
margin-right: 0;
margin-top: 0;
padding-top: 1em;
text-align: center;
}

.calibre12 {
height: 220px;
line-height: 1.2;
width: 402px;
}

The relevant resulting CSS is:

display: inline;
font-family: newbaskervilleitcstd-roman;
font-size: 18px;
height: 220px;
line-height: 21px;
text-align: center;
width: 402px;

[richo]

I do not know if it is me, possibly, but as long as I have some little more difficult question there is no help here. Pity.

[JSWolf]

Set the output profile to tablet. If that doesn't work, then it's because the images are too small.

[BetterRed]

@richo - did you set Preferences->Conversion->Common Options->Page Setup->Output Profile to Tablet and hit the Restore Defaults button (bottom left) in Conversion?



BR

[richo]

Originally Posted by JSWolf

Set the output profile to tablet. If that doesn't work, then it's because the images are too small.

Thank for tip, but why does the description of Tablet profile says:

does no resizing of images

Wouldn’t this means it will not do what I like to have. Bigger images on high resolution screen?

[richo]

Originally Posted by BetterRed

@richo - did you set Preferences->Conversion->Common Options->Page Setup->Output Profile to Tablet and hit the Restore Defaults button (bottom left) in Conversion?
BR

Thanks for the instruction, but your restore default button remove the setting to table done just one step before that. Anyway I did restore default, tried it, no change. Went there again set output profile to table, same result.

In every suggestion calibre leaves sizing of image and sizing of <p> around it in CSS. If I select different profile, for example input Kindle profile output Kind Voyage, or input default and output Nook HD+ Images are never resized and CSS still contains same size limits in width and height as dimension of the pictures.

It seem as calibre would completely ignore any profile settings the results are same every time without any effect on which page profile I choose.

[jhowell]

Calibre can automatically downscale the resolution of images to save storage on devices that only have a low resolution screen.

This does not control how much of the device's screen is taken up by each image. That is part of the formatting of the book and will need to be changed manually using an EPUB editor. As each book is coded differently the changes needed will vary from book to book and would be difficult to automate.

[richo]

Originally Posted by jhowell

Calibre can automatically downscale the resolution of images to save storage on devices that only have a low resolution screen.

This does not control how much of the device's screen is taken up by each image. That is part of the formatting of the book and will need to be changed manually using an EPUB editor. As each book is coded differently the changes needed will vary from book to book and would be difficult to automate.

Are you saying that Calibre is never going to remove own calibre styles where width and high is defined and is also not going to upscale images to use higher resolution of the e-reader chosen from profile?

If that is true I wonder why there are these profiles in Calibre at all?

[BetterRed]

Originally Posted by jhowell

Calibre can automatically downscale the resolution of images to save storage on devices that only have a low resolution screen.

- and AFAIK calibre will never upscale an image to match the resolution of a device, because upscaling images usually gives very poor results.

Originally Posted by richo

Are you saying that Calibre is never going to remove own calibre styles where width and high is defined and is also not going to upscale images to use higher resolution of the e-reader chosen from profile?

For covers in particular. what many people do is to find the highest res image available and put that in the library. As jhowell has said, Calibre will downscale it when sending to low res devices. Most tablet apps will downscale images to fit, with options to upscale, zoom, and pan etc.

Originally Posted by richo

If that is true I wonder why there are these profiles in Calibre at all?

Legacy perhaps - calibre is 10+ years old with ~3M active users.

BR

[richo]

OK. Maybe you know if there is an option which will instruct calibre to enlarge the images? Maybe some sort of workaround to re-run conversion from certain step (when I isolated images using debug output and enlarged them manually).

Thank you for suggestion.