Important: Keep the camera as still as possible while shooting all the frames or use a tripod to hold it.
In HDR mode the camera captures three successive frames at different exposure levels and fuse them together in order to produce a high dynamic range image.
In this mode the frames at different exposure levels are captured but not processed. This is useful when you plan to fuse them later using for example the application provided by us for desktop computers.
Single shot mode
This mode is similar to the classic camera application and it includes advanced features such as pinch to zoom exposure point and locked focus.
Keep the camera as still as possible while shooting all the frames or use a tripod to hold it.
Before processing images at high resolution it is recommended to close all other background applications.
Enable the camera flash when there is not enough ambient light. The flash is triggered on the last frame.
The images fuse process can be skipped. In this case only the bracketed frames will be captured and saved. An HDR image can be produced at a later time using Fuse Images menu option or an external (desktop) application. Such an application is available at no additional cost at: www.hdrphotocamera.com.
Tip: When noticing large or intense grey areas in the fused HDR image, reducing the exposure difference between the over exposed frame and the under exposed one will usually help obtaining better results.
When pressing the on-screen camera button or after a full press on the hardware button the camera will automatically focus before taking the pictures.
In order to manually focus you must press the hardware camera button half way down and hold it until the green rectangle is displayed in the middle of the view finder, then continue to press the button to take the pictures.
You can adjust exposure levels for each frame before taking the pictures. When doing this an on-screen preview will help choosing the best value. By default the first frame is over exposed (+2.5), the second one is normally exposed (+0) and the last one is under exposed (-2.5). In general you need to over expose the first frame until dark areas in the scene are visible and under expose the last frame until there is no glow on the bright areas. Too much over exposed or too much under exposed frames may result in poor image alignment or artifacts (dark-bright gradients) in the fused HDR image, in such special cases using a tripod and adapting fuse parameters might be necessary.
There are three fuse parameters Contrast, Saturation and Exposedness (well-exposedness), with default values of 1, 1 and 5 respectively. When setting any of the parameters on 0 the corresponding characteristic will not be taken into consideration in the fuse process.
Although not recommended the bracketing speed can be customized. The default value, Medium, is adequate for almost all situations. Quick option can be selected for very bright scenes with slow moving objects (e.g.: clouds). This will reduce ghost effects. Slow option can be useful in very dark scenes. Still, you should note that fully dark scenes can not be over exposed and using the flash is sometimes the only available solution.
Images can be fused with different parameters. Pressing fuse button multiple times, for already fused frames, will result in multiple versions for the same HDR file (e.g.: Img251HDR.jpg, Img251HDR(1).jpg, Img251HDR(2).jpg ...).
Q: Where can I find the HDR Photo Camera desktop (PC) application?
A: The first public version for the desktop application it is scheduled for release during the third quarter of 2011. In the meantime if you want to have a preview or want to try the beta version please contact us and we shall e-mail it to you.
Q: How can I upgrade "HDR Photo Camera" from Ovi Store?
A: To upgrade to a new version you need to uninstall first HDR Photo Camera application from the phone "Application manager", then open Ovi Store and select "Account" option (on the top-right corner). Here under "My Stuff" section you will find HDR Photo Camera. Click on it and you will have the possibility to re-download and upgrade it.
Q: I have followed your instructions and I still can not upgrade via Ovi Store, what next?
A: Please contact us and allow us a bit of time, we are working on an adequate solution for these particular cases.
Q: When fusing images at high resolution sometimes I get "substraction of different size matrices" error and fuse process stops, why?
A: The exception is caused by a slight inconsistency between recently released Qt versions 4.7.3/2 and previous versions. We have compensated the problem and an application update has been released.
Q: What does "HDR" mean?
A: "HDR" is the acronym for "High Dynamic Range" and usually refers to imaging techniques used to allow greater dynamic range of luminance between the lightest and darkest areas of an image.
"The idea of using several exposures to fix a too-extreme range of luminance was pioneered as early as the 1850s by Gustave Le Gray to render seascapes showing both the sky and the sea. Such rendering was impossible at the time using standard techniques, the luminosity range being too extreme. Le Gray used one negative for the sky, and another one with a longer exposure for the sea, and combined the two in a single picture in positive."