Comp

• Duplicate - It copies the exact image. 
• Image Menu - contains tool for manipulating the entire image in some way.
• Mode - Used to change the color mode of the image. 
• RGB - Converts the image in RGB Color.
• Gray Scale - Converts the image in Gray scale color. 
• Indexed - Converts the image in indexed color.
• Precision - Defines the quality, condition, and fact for being accurate.
• Color Management - used to change the ICC color profile associated with an image.
• Assign Color Profile - used to assign a new ICC profile.
• Enable Color Management - allows you to assign a GIMP built-in sRGB.
• Convert to color profile - used to transtorm an image from its current color profile.
• Discard Color Profile - used to disable the image's currently assigned.
• Save color profile to file - used to save to disk a copy of the ICC profile 
• Transform - used to transform the image by flipping it, rotating it, or cropping it.
• Canvas Size - Reducing the image size.
• Fit Canvas to Layers - accept the canvas size to the size of the most significant layer.
• Fit Canvas to Selection - adapt the canvas size to the size of the current image. 
• Print Size - change the dimension of a printed image and its resolution.
• Scale Image - to enlarge or reduce the size of the image in the number of pixels.
• Crop to Content - eliminate the borders from an image. 
• Crop to Selection - to crop the image from the selection.
• Slice Using Guides - slice up the current image based on the image's guides.
• Zealous Crop - to crop an image using a single solid color as a guide.
• Merge Visible Layers - to merge the layers into a single layer.
• Flattern Image - to merge all of the image layers into a single layer with no transparency.
• Guides - consists of several commands for removing and adding the guides.
• Configure Grid - set the properties of the grid.
• Align Visible Layers - to position the visible layers.
• Image Properties - display the additional information about the image.
• Duplicate - Ctrl + D
• Slice Using Guides - Also known as Image Cutter
• Merge Visible Layers - Ctrl + M
• Layer - Stack of slides 
• New from Visible - merge the visible layers into new layer.
• New Layer - add a new empty layer.
• New Layer Group - useful for managing the layers.
• Duplicate Layer - add a new layer to the image, which is identical active layer.
• Merge Down - merge the active layer with the layer just below the stack.
• Delete layer - used to delete active layer.
• Stack - used to manage the layers from the layer stack.