The full easyHDR PRO documentation is available in form of a PDF document. You can get it from the "download" section of this website.
In addition to the PDF documentation you may also find the following articles interesting:
The new digital cameras are equipped with image sensors with more and more Mega Pixels. Bigger photos mean better resolution - of course if the camera lens is good enough. However it also means that editing such an image requires more memory and more processing power. If the CPU is slower then the processing takes just a bit more time. In case of memory we are now on the limit of 32-bit systems, where only 2GB of memory can be mapped for one application. In some cases it's beginning to be a real problem.
Of course with easyHDR it is possible to load even biggest photos taken at full resolution with modern digital cameras. There is however a problem when you want to tone map a really big mosaic of photos - i.e. a panorama.
EasyHDR as any HDR image editing software needs a lot of memory to allocate several big buffers. The HDR techniques need more memory than simple image editing, because the image data has very high dynamic range. For example to store one pixel of a True-Color, 24-bit bitmap we need 3 bytes; one byte (value between 0..255) for each color channel. When we want to store high precision, HDR color pixel we need 12 bytes; 4 bytes (32-bit floating point number) for each channel.
It is possible for an application to allocate more memory than the amount of RAM installed in the machine, but in such a case Hard Disk is used (which is much slower). So if you want to use applications that require a lot of memory, the first thing to do is to increase the amount of RAM in your system.
If you already have 4GB of RAM and 32-bit operating system you probably already found out that any application can use only 2GB. In fact due to memory fragmentation issues it is possible to allocate even several hundreds of megabytes less. The only thing you can do here is to enable /3GB switch in Windows XP or IncreaseUserVA in Windows Vista. It allows using up to 3GB of Virtual Memory by user applications. Read more: setting /3GB switch in Windows XP, 2000 & 2003 Server, setting IncreaseUserVA in Windows Vista (changing the above mentioned boot parameters should be done only by advanced users of Windows).
EasyHDR PRO has a special mode for memory usage reduction. It can be used if you just want to load one very big or several very big photos, do either LDR enhancement or HDR generation and finally just do tone mapping. When this mode is enabled, some memory is saved by disabling alignment, chromatic aberration correction and post-processing functions.
When trying to process huge digital photographs remember to close all unnecessary applications that could also require big amounts of memory.
Memory usage while tone mapping a 67 MPix photo with easyHDR PRO 2.01.1 (4GB of RAM, /3GB switch enabled on Win XP Home SP3, Memory Usage Reduction Mode enabled).
