If you are working with linear ( gamma = 1) data, then you should apply a gamma of 2.2 on the Stitch the images as per usual into a TIFF file, you can use enblend as the The TIFF images can be loaded into hugin as per usual except:ĮXIF information about the Field of View was lost during the PPM stage, so the field of view will need to be re-entered manually, re-optimised with PTOptimizer or transferred from the RAW file using exiftool:Įxiftool -tagsfromfile DSCN3088.nef -overwrite_original_in_place -exif:all DSCN3088.tif If necessary, correct chromatic aberration with fulla at this stage. You can now delete the intermediate PPM files.Īlternatively UFRaw can be used for the entire conversion from RAW. Gamma correction is also applied at this stage since RAW data is generally linearĪnd difficult to view without colour profile management (not yet supported by hugin).
Note that I rotated them at the same time since these are portrait shots. ImageMagick to create 16bit per channel TIFF files:Ĭonvert -rotate 270 -gamma 2.2 dscn3088.ppm dscn3088.tifĬonvert -rotate 270 -gamma 2.2 dscn3089.ppm dscn3089.tif These PPM files are not readable by hugin or nona, so the next step is to use To combine bracketed exposures in a HDR workflow with hugin. If you need a greater dynamic range than found in RAW images, it is possible Note that although hugin, nona and enblend support HDR floating-point data, there is no real lossĬonverting RAW data to 16bit colour depth as RAW images are typically only 12bit in theįirst place.
Start by using dcraw to read the RAW files and batch convert them into portable 16bit perĬhannel PPM files.
It is a simple HOWTO listing the tools available and how This tutorial doesn't cover reasons why you might want to shoot with RAW and