MobileRead Forums - View Single Post - Large images on Kindle... what goes on under the hood?

Oxford-eBooks · 11-29-2022, 10:26 AM

A project I'm doing for a client requires relatively large images in the content which they want to be able to zoom in on and examine.
We don't need anything CRAZY, and I'd stick my finger in the air and say 2000px wide would be just fine (with a portrait aspect).

We've got 1000x1692 JPGs in at the moment and if I open up an original image on my PC in the windows image viewer, size the window it to about tablet size and zoom in, it looks kind of okay -- yes, this is not an exact replication, but I get the general feel for how it'll degrade on zoom with THAT partcular zoom algorithm yadda yadda.

The results are less good in KP3 and my last post brought up some really interesting talk about the convesion process when opening in KP3 and also in the final distribution process.

SO:
1. If I put in (say) 2000px wide versions am I going to get 2000 pixels to zoom and pan with on the consumer end?*
2. What processing and rules DOES happen at that point? Image resizing, JPG quality changes, etc. It'll be handy to know what I'm up against next time I have to deal with images that are more than just purely decorative**

Maybe my search-fu is weak, but much of the information I've found is quite old on this, and I KNOW there are certain folk on here that have their ear to the ground re distro processing! :notworthy:

Cheers folks!

===

* On a decent device. Anyone with lower spec of legacy devices are just gonna have to live with it (client is fine with that).

** Yes, yes, all that about critical information should be in live text.

11-29-2022, 10:26 AM	#1
Oxford-eBooks Zealot Posts: 138 Karma: 12096 Join Date: May 2010 Device: Loads!	Large images on Kindle... what goes on under the hood? A project I'm doing for a client requires relatively large images in the content which they want to be able to zoom in on and examine. We don't need anything CRAZY, and I'd stick my finger in the air and say 2000px wide would be just fine (with a portrait aspect). We've got 1000x1692 JPGs in at the moment and if I open up an original image on my PC in the windows image viewer, size the window it to about tablet size and zoom in, it looks kind of okay -- yes, this is not an exact replication, but I get the general feel for how it'll degrade on zoom with THAT partcular zoom algorithm yadda yadda. The results are less good in KP3 and my last post brought up some really interesting talk about the convesion process when opening in KP3 and also in the final distribution process. SO: 1. If I put in (say) 2000px wide versions am I going to get 2000 pixels to zoom and pan with on the consumer end?* 2. What processing and rules DOES happen at that point? Image resizing, JPG quality changes, etc. It'll be handy to know what I'm up against next time I have to deal with images that are more than just purely decorative** Maybe my search-fu is weak, but much of the information I've found is quite old on this, and I KNOW there are certain folk on here that have their ear to the ground re distro processing! :notworthy: Cheers folks! === * On a decent device. Anyone with lower spec of legacy devices are just gonna have to live with it (client is fine with that). ** Yes, yes, all that about critical information should be in live text.