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Subtract from selection

Hold Ctrl and then make another selection.

Add to selection

Hold Shift and then make another selection.

Solving jigsaw puzzle in GIMP

http://nastyissues.blogspot.com/2019/11/solving-jigsaw-puzzle-in-gimp.html https://youtu.be/uydt3Q-CWi4

Change layer

Page Down/Up

https://docs.gimp.org/2.10/en/gimp-layer-next.html

Stack pictures

Open one picture. File -> Open as Layers. Image -> Canvas Size --> make much bigger Select layers one by one and move. Image -> Fit Canvas to Layers.

https://gimper.net/threads/re-how-can-i-put-multiple-pics-side-by-side-to-make-one-picture.1042/

Replace one color with another

Colors -> Map -> Color Exchange

https://docs.gimp.org/en/plug-in-exchange.html

Bucket tool

If not working, make sure Select -> None

Delete Parts from Transparent Image

Select Magic Wand. Set Mode to "Add to the current selection". Select parts to delete. Edit -> Clear.

https://en.wikibooks.org/wiki/GIMP/Removal_of_Unwanted_Elements_in_the_Image

Save as PNG. Open PNG. Use eraser.

Show Toolbox

Windows -> Recently Closed Docks --> Toolbox

https://superuser.com/questions/645532/i-accidentally-closed-my-gimp-toolbox-can-i-get-it-back

You can create a new Toolbox using Windows -> New Toolbox

Make transparent

Several options:

Fuzzy select -> Edit -> Clear.

Use eraser on layer with alpha channel.

Colors -> Color to Alpha

https://graphicdesign.stackexchange.com/questions/5446/making-the-background-of-an-image-transparent-in-gimp

Delete layer

Use Ctrl + X to cut layer as a hack.

https://superuser.com/questions/603406/whats-the-shortcut-to-delete-selected-layer-in-gimp/

Create layer from selection

F (lasso) to create freeform selection.

Select --> Float (Shift + Ctrl + L), then New Layer (Shift + Ctrl + N)

https://logosbynick.com/gimp-make-selection-new-layer/

Scale Selection

Shift + T

https://graphicdesign.stackexchange.com/questions/49941/how-can-i-shrink-these-areas-using-gimp

Paste face into picture

Paths tool to draw path (press Cmd to close the curve).

Edit -> Copy, Edit -> Paste -> New Layer Scale button (in Toolbox) -> click Link to preserve aspect ratio

https://www.youtube.com/watch?v=avsFWzp6iXw

Zoom

+ - zoom in - - zoom out View -> Zoom -> Zoom In/Out

Fit Canvas to Image

Image -> Fit Canvas to Layers/Selection

Crop picture

Crop one layer: Layer -> Crop to Selection

Alternatively, use Crop Tool, and ensure "Current layer only" is checked in options.

https://graphicdesign.stackexchange.com/questions/7137/gimp-how-to-crop-a-layer https://docs.gimp.org/en/gimp-layer-crop.html

Shift + C. Exacto Knife icon. Tools -> Transform Tools -> Crop.

Layer Mask

Allows you to selectively modify opacity of different areas of a layer.

https://www.gimp.org/tutorials/Layer_Masks/

Rubber Stamp

Text box. Add Rectangle around it. Select -> Border. Merge layers. Rotate Tool to rotate. Add Layer Mask - White (Full Opacity). Use Brush - Confetti to make stamp look faded. Use Ink tool to add lines to make stamp look more faded.

https://www.youtube.com/watch?v=9-WyO01SIU4 https://www.youtube.com/watch?v=k76hBRampi0#t=211.052769

Diagonal cut

Use lasso tool -> right click -> Edit -> paste as -> new layer.

Draw line

Use paint brush. Click, shift click.