# Main menu

## Filters

By moving a track bar you can change the visual aspects of a picture. There are following filters available:

### Brightness

Adjusts picture brightness.

### Contrast

Adjusts differences between dark and light parts of the picture.

### Sharpen

Focuses blurry images by increasing the contrast of adjacent pixels.

### Gaussian Blur

Softens the image by averaging nearby pixels. It eliminates noise, but the image becomes less distinct.

### Gamma Correction

Changes brightness using a logarithmic scale for visual perception. Gamma correction is used to alter hardware color maps to compensate for the non-linearities in the phosphor brightness of monitors.

## Rotate

### Rotate left

Rotates the picture counterclockwise by a quarter-turn.

### Rotate right

Rotates the picture clockwise by a quarter-turn.

### Flip horizontal

Flips the picture horizontally, along the vertical axis.

### Flip vertical

Flips the picture vertically, along the horizontal axis.

## Crop

Allows you to cut out and to use only a certain part of a picture. Choose Crop and cut the picture by a mouse.

## Undo

Cancels the last operation.

## Original

Restores the picture to the original before all changes.

## Help

Displays this help.

## Back

Confirms accomplished changes and returns you back to the Create Room or the Modify Room.