Feature Request: Faster JPEG loading

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mad_ady
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Joined: Mon Aug 04, 2008 5:36 pm

Feature Request: Faster JPEG loading

Postby mad_ady » Tue Aug 05, 2008 6:07 am

Hello everybody!

I enjoy xnview pocket very much on my Fujitsu-Siemens N560 and I would like to use it as a picture frame/picture slide show viewer. The pictures I normally view using xnview are holiday photos about 700k-1.2M in size. Unfortunatelly, I like viewing the images in full screen mode (as slideshow) and they take about 2 seconds to load and render. The image resolution is about 1600x1200.

I've tried with other programs (PDAMill Viewer for instance or SPB Imageer) and it loads and renders the images pretty quickly (in about 0.5 seconds), so the limitation isn't in the storage card speed.

Is there anything you can do to speed up jpeg rendering? I'm thinking other programs don't decode the whole file and thus are faster (and the quality difference on a small display isn't that upsetting).

If you choose to implement this fast jpeg rendering, it should probably be as an option.

I realize this may be a lot of work, but maybe you can tune some parameters in the jpeg rendering process and obtain a faster decoding speed.

Thanks for this great program and support!
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xnview
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Re: Feature Request: Faster JPEG loading

Postby xnview » Tue Aug 05, 2008 7:31 am

ok, i'll try
Pierre.

mad_ady
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Postby mad_ady » Tue Aug 05, 2008 11:21 am

Many thanks!
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xnview
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Re: Feature Request: Faster JPEG loading

Postby xnview » Mon Dec 08, 2008 8:28 am

mad_ady wrote:Is there anything you can do to speed up jpeg rendering? I'm thinking other programs don't decode the whole file and thus are faster (and the quality difference on a small display isn't that upsetting).

I've check, and xnview pocket doens't decode full jpeg too. You load picture in 'Fit to window', right?
Pierre.

mad_ady
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Joined: Mon Aug 04, 2008 5:36 pm

Re: Feature Request: Faster JPEG loading

Postby mad_ady » Fri Jul 24, 2009 2:59 pm

Hello, sorry for my long absence - I lost track of this thread...

To answer your question - yes, I use Fit to window to view my pictures.

I ran some tests with various sizes of pictures, and for a picture of 8Mpx (2.5MB - 3264x2448) it takes about 4-8 seconds for the picture to load. If I am using a different viewer (CM ImageViewer http://www.pocketcm.com/imageviewer.php) the same images load (progressively) in about 1 second on the same hardware. So, it seems there is a major difference in the way jpegs are decoded.

If you need, I can send you sample photos or run tests to get more information.

Take care!
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xnview
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Re: Feature Request: Faster JPEG loading

Postby xnview » Mon Jul 27, 2009 12:05 pm

mad_ady wrote:Hello, sorry for my long absence - I lost track of this thread...

To answer your question - yes, I use Fit to window to view my pictures.

I ran some tests with various sizes of pictures, and for a picture of 8Mpx (2.5MB - 3264x2448) it takes about 4-8 seconds for the picture to load. If I am using a different viewer (CM ImageViewer http://www.pocketcm.com/imageviewer.php) the same images load (progressively) in about 1 second on the same hardware. So, it seems there is a major difference in the way jpegs are decoded.

If you need, I can send you sample photos or run tests to get more information.

yes please
Pierre.


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