Using High Dynamic Range in Astrophotography
Producing a high dynamic range image, also known as HDR image, is easy when using the proper software program. Easy HDR Pro is a useful image processing program, able to produce and enhance the images you have taken with a simple digital camera. Using high dynamic range in astrophotography will help you optimize your pictures and achieve maximum quality and clarity, manipulating the exposure settings with the HDR image software.
How Does HDR Work?
HDR images require you to take a set of similar pictures of the same scene, but with different settings. The HDR image produced will come out of these pictures. The HDR image is actually an artificial picture, created at a totally different dynamic range. There is a long process behind creating an HDR image, which involves dynamic range compression. This process consists of several individual processes – some of them are automated, others are manually done. Tone mapping is necessary in this case because it can add to the enhancement of the image range, achieving the desired compression.
HDR and Modern DSLRs
Modern cameras are well equipped, featuring better CCD sensors than in the past, therefore, you might not need to take many pictures. Even 2 or 3 pictures might be enough for tone mapping. Especially in astrophotography, taking image sequences is not always easy, since you have to maintain long exposure settings. HDR program allows you to tone map one or two pictures, or even better, one RAW image.
In this case, you can apply both local and global operators and add more realistic results, allowing high levels of compression and thus, offering you many more possibilities with your pictures.