Upscale
Use the Upscale Mode to upscale your image.

There are two methods to resize your image.
- SCALE - upscale your image by a multiplier of up to 6x
- DIMENSIONS- upscale your image by inputting a custom width or height
Custom Scale Multiplier
- In Upscale mode, click "Custom"
- In the "Scale factor" box, type in your multiplier
- Press Enter
The dimensions of your image automatically adjust after you set the scale. Custom scales can be specified by up to 2 decimal points.

The default PPI is 300ppi. You can change this in your Preferences panel.
Set your default output size
1. Go to your Preferences in the Gigapixel Main Menu

2. Under Settings, click on Upscale and resize
3. In Resize Type, change the drop down boxes to "Set output type"
4. Select your type

5. Once you've selected your type, you can make additional settings including setting up the output resolution.

6. Click Save to finish.
Longest Side
Upscale a batch of images by it's longest side.
To enable longest side, be sure to select which images you want to upscale by clicking the check mark boxes in the file list.
When multiple images are selected, the Dimensions show "mixed" indicating that there are multiple values across all images.
Under "Longest edge" type in the number value you want to apply.

The longest side option does not appear when only one image is selected.