Merging exposures from a single image
I return to the fray with the great unknown "enfuse" free software that is wonderful.
This time the objective is to propose a simple way to dump the dynamic range of a RAW to JPG.
As we know the RAW file as it comes out of the camera has a dynamic range much larger than a jpg, because of this we can change the exposure to reveal the RAW and improving the light of the photos we have gone a little burned or a bit dark. The "sect" to expose to the right is based precisely on this to overexpose everything possible to burn an image without anything and then adjust the exposure to reveal maximizing the amount of information received by the pixels and thus reducing noise.
Passing the RAW to JPG is basically what we do select a small part of the dynamic range captured in RAW and turned to JPG, it is often more than enough but in other cases the dynamic range of the scene is greater than what can display a JPG. The following method is intended to merge the dynamic range of a RAW file into a JPG using free tools and free.
Step 1: From RAW generate all the JPGs for all possible exposures.
Ie starting from RAW to JPG generate exposure -3, -2.5, -2, -1.5 and so on until +3.
This can be done by hand but is tedious, I use a software called ufraw, very nice to reveal RAWs and has a batch mode. To install ufraw
visit this page:
http://ufraw.sourceforge.net/
Once installed I made 2 batch files (for Windows) to automate the process:
enfuse.bat
-
---------------------- ----------- cut for%% Y in (% 1) do uf.bat%% And
--------------------------------------
uf.bat
- ------------- ------------------------ cut
ECHO% 1 for%% X in (-3 -2.5 -2 -1.5 -1 -0.5 0 0.5 1 1.5 2 2.5 3) do "c: \\ Program Files \\ Gimp-2.0 \\ bin \\ ufraw-batch. exe "- out-type = jpeg - compression = 100 - Exposure =%% X% 1 - wb = camera - output =% 1_%% ----------
X.jpg -------------------------------
(the guioncitos are not part of the file, had to clarify your understanding. ..)
Just create the files with the specified name with notepad or similar and replace the uf.bat the path they have chosen to install ufraw on their computers.
Storing these two files in a directory along with the RAW to process (or several) so we use:
enfuse.bat *. CR2 (Process all RAW)
or enfuse.bat pepe.CR2 (process a specific RAW)
simpaticos The result is 13. Jpg files for each RAW with all of our RAW dynamic range, the following is merge all.
enfuse Package / Enblend if you do not have this here:
http://enblend.sourceforge.net/
The enfuseGUI you can download it from here:
http://software.bergmark.com/enfuseGUI /
Once installed, simply change the number of exposures to 13, use the little button "+" to select the files to merge and click on "enfuse!". After a few Minutillo we should have a nice file TIFF with the end result.
The final file is an image of low contrast high contrast global and local that is good process it using levels to adjust the contrast. Gimp, Photoshop or whatever you use if you are reading at this point going to work very well. Auto-levels work well in most cases.
Example:
JPG image exposure based on more reasonable (and left the Chamber)
JPG image based on the RAW Enfusion:
practical applications:
I found that images with The skies are usually pretty good results as the dynamic range of the sky and the subject that we are taking is generally not go well in a JPG. Differences
HDR
tonemapping
Here there simply fusion exhibition so the overall result is an image of less visual impact but a more realistic HDR. Should not occur halos and other artifacts displayed in the HDRs.
Sources:
The enfuse and ufraw is nothing new and many people use. This process as far as I've invented myself, and I firmly believe that sharing what you learn or develop the best way to learn. Besides there is nothing magical here, anyone could have invented this in their homes in a rainy day.
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