Source image setup screen

Set how much columns and rows you need in the mosaic. You will see active area as a rectangle with cells over the main image. If you click on this rectangle with your mouse you'll see handles on its border. When active area is selected you may move and resize it using the mouse or keys with arrows.

Press Arrow key to move active area one pixel e.g. press Left Arrow to move active area one pixel left.
Press Ctrl+Arrow key to move active area 10 pixel e.g. press Ctrl+Left Arrow to move active area 10 pixel left.
Press Shift+Arrow key to resize active area proportionally e.g. press Shift+Left Arrow to decrease active area, press Shift+Right Arrow to enlarge active area.
Press Ctrl+Shift+Arrow key to move selection on its width or height. It is possible only if there are enough free space around selection.

To expand selection over maximum allowed area press Max button.

If Stretch checkbox is checked you may free stretch selection area.
In this case tile images in the mosaic will be stretched to the needed size.
Stretch option could be activated at the Advanced preferences screen.
When you press Max buttom with Stretch checkbox on all image will be covered with selection and cells will be stretched.

If there are too many cells defined, it could be hard to see the image itself below grid lines. In this case uncheck Grid checkbox. Only outer bounds of selection will be visible.

To make project from a currently opened image press Apply button. This will bring up Save as dialogue. You have to input a name for your new project. When project is saved it would be opened in the Mazaika main screen.

Use Source image setup menu for additional options.