dark parts of image brighter only

[janmartin3]

Hello,

We have a real lot of panoramas.
Dark areas needs to become brighter, without over-exposing the already bright parts.

I am looking for a command-line to do this.
We then will apply this fully automatic.

Single panorama:
http://bit.ly/1h7wU8l

A few panoramas for development:
http://bit.ly/TtnsHh

Contact information:
http://bit.ly/1i6M5Pc

Thanks,
Jan

[snibgo]

Dark areas needs to become brighter, without over-exposing the already bright parts.

There are many way of doing this, depending on what you are trying to do.

I suggest you make a "before" and "after" image, showing what you want. You could do this in Gimp, perhaps with menu "Colors, Curves". If all images need exactly the same operation, use Gimp to make a clut or hald-clut, and use ImageMagick to apply it.

[fmw42]

What version of Imagemagick are you using and especially on what platform?

try for starters

Code: Select all

convert 000000071.jpg -gamma 1.5 test1.png

or

Code: Select all

convert 000000071.jpg +sigmoidal-contrast 3x100% test2.png

Adjust the values 1.5 or 3 to suit. As user snibgo says, there are many ways to work this.


If on Linux/Mac OSX or Windows with Cygwin, you can look at some of my script at the link below, such as autotone and numerous others