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Preview image for Rawzor file
Is it possible to add thumbnail and preview image to Rawzor file (eg. as a small and low resolution jpg)? I know it adds about 100KB to the final file but such improvement provide a possibility to fast browsing image without necessity of extracting it.
I try to do it be myself using an combination of “copy /b DSC06578.JPG + DSC06578.ARW.RWZ DSC06578.JPG”, but finally I only get preview but Rawzor can't extract it (of course I change extension to .rwz).
I try to do it be myself using an combination of “copy /b DSC06578.JPG + DSC06578.ARW.RWZ DSC06578.JPG”, but finally I only get preview but Rawzor can't extract it (of course I change extension to .rwz).
I’m confused
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Inappropriate?Moriss, thanks for sharing your idea. I believe your goal here is to be able to see preview images in windows explorer. And you are trying to achieve this by adding a small jpeg image to the beginning of your .rwz file.
As you have noticed, you will then not be able to extract the .rwz file because it changes the file's internal bytes and Rawzor can no longer find the compressed data it needs.
However, the good news is that we are working on a solution for this problem.
As you probably already know, all raw images already have a thumbnail and preview inside them which is used to show their quick preview on camera screen and in windows explorer (if you have the camera manufacturer's software installed).
In the compressed .rwz file, Rawzor retains that original thumbnail and we are working on a plugin for windows using which you will be able to see your thumbnails just like see them for your original raw images. It should be ready for release within a month or so.
In the meanwhile, you can use XnView (free), RawTherapee (free), or Konvertor (paid) to browse your images with thumbnails. All these software support .rwz format images. If you face any problems with these software, you can ask here or at forums of these software, we will all be glad to help you.
Also, if you still feel that adding a small jpeg to the beginning of .rwz file is a better solution and that we should consider doing that within Rawzor, let me know.
Thanks again for sharing your idea.
I’m thankful
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Inappropriate?First of all I am very glad for Your fast reply and of course your work of Rawzor. In my opinion this project fulfill the gap in the lossless raw-compression standard.
For me the thumbnails aren't really important because I work with Total Commander as a shell manager. But I still need a simple and fast way to browse my photos without extracting it. Before I decided to post my idea I had tried browsers supported Rawzore extension and they had been working to slow for me. I suppose this statement is connected with methods provided in SDK. I notice that browsers should decompress raw file to have a possibility of previewing embedded image from the native .raw. When I use Konvertor to preview 100 photos compressed in Rawzor from DVD-Ram it's simply crash.
Adding a small jpeg image to the beginning of .rwz file provide a better compatibility with other browsers, users can use they favorite software and give them a chance to find desirable photo to work with in very short time. After that they still should decompress the correct one to work with they favorite post-processing software.
As a salvation of this problem you can extract embedded preview image from raw, shrink it (half resolution and medium jpeg compression = less than 100 KB) and add it as a header of the .rwz file.
I suppose that many Rawzor user will be sympathize with this idea because it's providing a very fast way to browse photos in favorite software without necessity of creating sophisticated plugins.
I’m excited
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Inappropriate?Thanks for sharing your views, I will look in more detail into this option.
Applications should be able to get the embedded preview from inside compressed .rwz files without any speed overhead. I will get in touch with Konvertor team on potential crashes and speed issues. Thanks for bringing this to my notice.
I’m concerned
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Inappropriate?After your post I have been testing other browsers:
Raw Therapee works but it is slower than Konwertor.
XinView (latest version) doesn't support .rwz file extension; there is information about supporting in change log but in associations menu i can't find appropriate switch.
More over I tested Rawzor SDK with example program and I noticed that there wasn't any difference between extracting method in file weight (tested on Sony Alpha .arw file) – so I still suppose that browser firstly decompress .rwz file for extracting embedded .jpg from .arw (maybe it's only problem with Sony extension).
I’m unsure
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Inappropriate?For XnView, you will need to install the plugin from
http://newsgroup.xnview.com/viewtopic...
About file weight when extracting thumbnail, Rawzor extracts only the thumbnail but creates the whole raw file with meta data and preview (with no raw data) so that the software can find the thumbnail in the same location inside the raw file where it expects it.
The thumbnail extraction is very fast, I will verify in these software the APIs they are using to make sure they are not accidentally using the full extraction where its not needed, Thanks for the bringing this up.
I’m thankful, concerned
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Inappropriate?On the other hand, I would very much like an option to replace the embedded preview with a smaller version, or even strip it entirely. (I'm working with .cr2 files, the embedded preview is 1600x1200 and 1/4 of that would be more than enough) -
Inappropriate?Dizzy, thats an interesting idea, it is something we should look at. Thanks.
(But this will take some time to implement, so don't expect it anytime soon ;-).
I’m very interested
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