Creating JPEGs from Camera RAW files

[reebear]

Hi all,
we have a problem when converting Camera RAW files (such as Pentax PEF, Canon CRW, etc.) into JPEGs. When using
nconvert.exe -out jpeg -o "<outputFilePath>" -overwrite "<sourceFilePath>"
the JPEGs always have a reduced brightness. The RAWs are 48 bits (3x16) whereas the JPEGs are 24 bits (3x8).

Is there any way to keep the brightness somehow

thanks a lot in advance and best regards
andreas

[xnview]

Do you have tried raw_autobalance, raw_camerabalance or raw_autobright?

[reebear]

Bonjour Pierre,

thanks for enlightening me!
Adding -raw_autobright and -raw_camerabalance to the commandline did the trick.

thanks a lot / merci bien
andreas

[reebear]

Hi,

the other interesting bit is that - since we have tried the -raw_* parameters - RAW files with a size of e.g. 4044 x 6080 pixels turn into JPEGs of 2022 x 3040 pixels in size.
When adding the parameter -resize 100% 100% - the command-line parser of nconvert seems to ignore the first percent sign and creates a file with a width of 100 pixels - using -resize 100%% 100% (i.e. doubling the percent sign in the first value) does the trick, but I guess you know that already.
I did not find a way to create a JPEG of the RAW file's image size of 4044 x 6080 pixels. Any ideas?

Also - despite the fact that for JPEG, a quality setting of 100 should be default, setting it to -q 100 actually increases the filesize compared to omitting the parameter.

best regards
andreas

[oops66]

Hello,
FI: In case of re-scaling ... a very interesting website about gamma error in picture scaling/re-scaling.
http://newsgroup.xnview.com/viewtopic.p ... 060#p58060