View Full Version : [Canola] Optimum Photo Resoltion??
Is there an optimum size to scale photos for viewing in Canola?
01-03-2008, 07:56 AM
I would say the right answer is : no.
That would be to exactly answer the question.
However, the screen resolution being 800x480px, that would make images fullscreen at this exact resolution.
Anyway, I don't really see the point of resizing images, though Canola can handle bigger and smaller sizes (of course, if your image is a 30mo JPG, it might take a little while :D)
I guess I really had two concerns.
1. Minimizing flash requirements to store the photos.
2. Optimizing Canola performance in terms of scaling the photos when flipping through them. I haven't tried full resolution photos, but a collegue of mine, also with a N800, says my Canola with scaled photos is MUCH faster than his with full resolution images.
As to the optimum resolution, when viewing photos in slide show mode, it appears to use a little less than the full vertical resolution. Wouldn't this be the ideal image height to scale the photos. It would minimize storage, reduce scaling time when flipping through the photos, and require no scaling when in slide show mode. Does anyone know what the vertical image size is when in slide slow mode?
01-04-2008, 02:58 AM
For sure, if you reduce to maximum height 480 it will be the perfect size and perfect memory consumption etc. But people really don't do this. I really envy apple on this, they just force people to pass their synchronizaton tool that converts the photos to their crap resolution where they can be really fancy and usable (fast answer to user interaction). For us we hear things like : "I want to place my card from my 10mega pixels camera" and it should be fast, and should not crash (imagine a 10mp photo loaded to ram?)
but for sure : this would be nice. But we would need a software for that. And then it needs to be cross platform, then it needs to deal with several medias, then.... it's huge. We have no more power to write that.
You're said "is not using the vertical resolution full" no? This is strange, if your photo is a regular photo (at least 640x480) it should already be fullscreen. Can you send me some samples?
I was mistaken about not using the full vertical resolution. I must have looking at an image which was scaled too small.
02-22-2008, 03:29 AM
Actually Adobe Photoshop Elements does a really good job of scaling pictures via its "export" feature. I use a couple of different Canon cameras, a 30D which has a aspect ratio similar to APS film cameras, and a Powershot 700 which has a 4:3 ratio. I group my pictures in "albums" within Elements, then select the Album, select all photos in the album, hit "export", and then set it for "jpeg", custom resolution of 800 x 480, and a directory and common file name (which it then numbers sequentially afterwards). The pictures scale beautifully and instead of 2-3+MB files nearly all are less than 100K. The beauty is the export feature doesn't screw up the aspect ratio even though I may have pictures from two different cameras in the same album - it simply uses the maximum value within my setting and then scales appropriatly the other dimension.
Example: A picture from the 30D has a resolution of 2160 x 1440 - the scaled exported picture ends up with a resolution of 720 x 480 (maximizing the vertical resolution).
A picture from the SD 700IS has a resolution of 2816 x 2112 - the scaled exported picture ends up with a resolution of 640 x 480 (again, maximizing the vertical resolution).
When I first tried this I just selected the canned 640 x 480 export option and that was fine for the SD 700IS pictures but the result of the 30D pictures was 640 X 426, as the export wouldn't exceed the 640 resolution when maintaining the correct aspect ratio. This resulted in a "border" around the picture on the n800 since it wasn't utilizing the full vertical resolution. Using the custom setting is the way to "force" the 480 vertical rez.
Anyway, it takes Photoshop Elements about 3 minutes to export around 250 pictures from one of my typical vacation albums, which are a mix of D-SLR (30D) and point-shoot pics from the SD 700. Instead of an album being over 500 MB, its around 25 MB and the pictures display almost instantly since there's no "on the fly" scaling on the n800. Well worth the extra few minutes imo (and if you happen to be using Photoshop's Album feature anyway :) ).
For what its worth
02-22-2008, 09:29 AM
Jeff: yes, this is a nice tip, and it for sure helps everything in the system goes smoothly :)
Loadtime, update, rotate everything.. and now Zoom =)
So if people do convert a little bit not only they can place more files, but also have a much more stable / snappy application :)))
Thanks for sharing the tip!
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