Adjust Gamma and Rotate Pictures With GIMP




Fixing exposure from insufficient lighting and rotating image from turned camera.

It is quite annoying to see pictures that are too dark to see what's in them. Sideways pictures are also annoying (among other photographic conditions). Fixing the pictures before uploading makes your work look more professional.

Step 1: Download the GIMP

If you haven't already, go to the GIMP website to download and install the appropriate version for your OS. Unlike Photoshop and others, The GIMP is free.

Step 2: Fix the Picture

Start The Gimp and load the underexposed picture.

From the drop-down menus, select Layer->Colors->Levels.

In the middle of the Levels window, you'll find the gamma adjustment field with the adjustment slider just above it. The middle sliding pointer is the gamma. Increase the gamma to lighten up the dark parts of the picture without affecting the lighter ones too much.

Step 3: Enjoy the Revealed Image.

So that's who's out there.

Step 4: Rotating Images

No, this Showy Ladyslipper isn't growing on a cliff side, I turned the camera for portrait format.

Step 5: ...turn, Turn, Turn...

Load your sideways (or upside down) picture.

Go to the Image->Transform menu and select the appropriate rotation you need.

Save the file (to original or Save As a new name).

Step 6: That's All It Takes.

That looks much better. Wasn't that easy?

The Minnesota state flower in it's proper orientation.

Step 7: Now Go and Play With GIMP's Other Tools.

There's so much more you can do with GIMP, from creating images from scratch to altering existing images. If you make a mistake, just don't save the changes.



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    12 Discussions


    Reply 9 years ago on Introduction

    That coon pic would still be too dark for a print without gamma or brightness/contrast adjustment.


    10 years ago on Introduction

    A Nice intro to using Gimp. You should do instructables on some of the other, cooler features. I did this using the stamp tool. I use that for everything.

    me wid shades002.jpgme wid shades001.jpg
    8 replies

    Reply 10 years ago on Introduction

    select the clone tool. Icon looks like a stamp. Then ctrl click on the area you want to copy. now when using this brush it will copy the area you ctrl clicked on. I used this to copy the poster across, covering my head. If you look closely you can see that the middle column is the same as the right column. If that made no sense I'll have to make an ible for it.


    Reply 10 years ago on Introduction

    thanks man that helped a bunch i have a question do you know how to make neon style tect in gimp?


    Reply 10 years ago on Introduction

    one basic way would be: - type your text then press 'path from text' (near the bottom of the tools pane). -Then with this path selected go to >Filters >Alpha to Logo >Alien Glow (or alien neon) This gets the basic glowing effect. You may have to play around with the options to get it how you want