GIMP Image Editing for CBSE Class 9 ICT, Step by Step Guide

GIMP (GNU Image Manipulation Program) is a free, open-source image editing software that is part of the CBSE Class 9 ICT syllabus. This chapter carries significant marks in both theory and practical exams. This guide covers all the tools and techniques you need to master.

What is GIMP?

GIMP stands for GNU Image Manipulation Program. It is a free and open-source image editor that provides many features similar to Adobe Photoshop.

Key facts for exams:

• GIMP is free software released under the GNU General Public License (GPL)
• It is available for Windows, macOS, and Linux
• Current version used in CBSE: GIMP 2.10, It supports formats like JPEG, PNG, GIF, BMP, TIFF, and its native format XCF

GIMP Interface Components

When you open GIMP, you see these main components:

Component	Purpose
Toolbox	Contains all drawing and selection tools
Tool Options	Shows settings for the currently selected tool
Image Window	The main area where you edit images
Layers Dialog	Shows all layers in the image
Menu Bar	File, Edit, Select, View, Image, Filters, Windows, Help
Color Palette	Foreground and background color selectors

Important GIMP Tools

Selection Tools

Selection tools help you select specific parts of an image for editing.

Tool	Shortcut	Purpose
Rectangle Select	R	Selects a rectangular area
Ellipse Select	E	Selects an oval/circular area
Free Select (Lasso)	F	Selects a freehand area
Fuzzy Select (Magic Wand)	U	Selects area by color similarity
Select by Color	Shift+O	Selects all areas of similar color
Scissors Select	I	Selects by detecting edges

Paint Tools

Tool	Shortcut	Purpose
Pencil	N	Draws hard-edged lines
Paintbrush	P	Draws soft-edged strokes
Eraser	Shift+E	Erases parts of the image
Bucket Fill	Shift+B	Fills an area with color
Gradient (Blend)	G	Creates a gradient fill
Airbrush	A	Spray-paint effect
Clone	C	Copies pixels from one area to another

Transform Tools

Tool	Shortcut	Purpose
Move	M	Moves layers or selections
Rotate	Shift+R	Rotates the image or layer
Scale	Shift+S	Resizes the image or layer
Flip	Shift+F	Flips horizontally or vertically
Crop	Shift+C	Crops the image
Perspective	Shift+P	Changes perspective

Other Tools

Tool	Shortcut	Purpose
Text	T	Adds text to the image
Color Picker	O	Picks a color from the image
Measure	Shift+M	Measures distance and angles
Zoom	Z	Zooms in or out

Step-by-Step Operations

1. How to Open an Image

1. Go to File menu
2. Click Open
3. Browse to the image location
4. Select the file and click Open

Alternatively, use the keyboard shortcut Ctrl + O.

2. How to Crop an Image

Cropping removes unwanted parts from the edges of an image.

1. Select the Crop Tool from the toolbox (or press Shift+C)
2. Click and drag on the image to define the area you want to keep
3. Adjust the selection by dragging the corners or edges
4. Press Enter to apply the crop

3. How to Resize an Image

1. Go to Image menu
2. Click Scale Image
3. Enter the new Width and Height
4. Make sure the chain link icon is connected to maintain aspect ratio
5. Click Scale

4. How to Rotate an Image

1. Go to Image menu
2. Click Transform
3. Choose the rotation angle:
   • Rotate 90 degrees clockwise
   • Rotate 90 degrees counter-clockwise
   • Rotate 180 degrees

For custom angles, use the Rotate Tool (Shift+R).

5. How to Flip an Image

1. Go to Image menu
2. Click Transform
3. Choose Flip Horizontally or Flip Vertically

6. How to Adjust Brightness and Contrast

1. Go to Colors menu
2. Click Brightness-Contrast
3. Adjust the Brightness slider (positive = brighter, negative = darker)
4. Adjust the Contrast slider
5. Click OK to apply

7. How to Change Color Balance

1. Go to Colors menu
2. Click Color Balance
3. Adjust sliders for Shadows, Midtones, and Highlights
4. Click OK

8. How to Apply Filters

Filters add special effects to images.

Steps to apply a Blur filter:

1. Go to Filters menu
2. Click Blur
3. Choose Gaussian Blur
4. Set the blur radius
5. Click OK

Steps to apply a Sharpen filter:

1. Go to Filters menu
2. Click Enhance
3. Choose Sharpen (Unsharp Mask)
4. Adjust settings
5. Click OK

Important Filters in GIMP

Filter Category	Filters	Effect
Blur	Gaussian Blur, Motion Blur	Softens the image
Enhance	Sharpen, Noise Reduction	Improves image quality
Distorts	Ripple, Whirl, Emboss	Creates distortion effects
Light and Shadow	Drop Shadow, Lens Flare	Adds lighting effects
Noise	HSV Noise, Scatter	Adds random noise
Edge-Detect	Edge, Neon	Highlights edges

Working with Layers

Layers are like transparent sheets stacked on top of each other. Each layer can contain different parts of the image.

Layer Operations

Operation	How To
Add New Layer	Layer menu > New Layer
Delete Layer	Layer menu > Delete Layer
Duplicate Layer	Layer menu > Duplicate Layer
Move Layer Up	Layer menu > Stack > Raise Layer
Move Layer Down	Layer menu > Stack > Lower Layer
Flatten Image	Image menu > Flatten Image
Merge Down	Layer menu > Merge Down

Layer Properties

• Opacity - Controls how transparent a layer is (0% = fully transparent, 100% = fully opaque)
• Visibility - The eye icon toggles whether a layer is visible
• Lock - Prevents accidental changes to a layer

Image File Formats

Format	Full Form	Best For	Transparency?
JPEG/JPG	Joint Photographic Experts Group	Photographs	No
PNG	Portable Network Graphics	Web graphics	Yes
GIF	Graphics Interchange Format	Simple animations	Yes (limited)
BMP	Bitmap	Simple images	No
TIFF	Tagged Image File Format	High-quality printing	Yes
XCF	eXperimental Computing Facility	GIMP native format	Yes

Exam tip: JPEG uses lossy compression (some quality is lost). PNG uses lossless compression (no quality loss). This is a very common exam question.

How to Save and Export

• Save (Ctrl+S), Saves in GIMP's native XCF format
• Export As (Ctrl+Shift+E), Saves in other formats like JPEG, PNG

Important Questions for Exam

Q1. What is GIMP? Why is it preferred over commercial software?

GIMP is a free and open-source image editing software. It is preferred because it is completely free, available on all operating systems, has professional-level features, and does not require a paid license.

Q2. What is the difference between lossy and lossless compression?

Lossy compression reduces file size by permanently removing some data, resulting in slight quality loss. JPEG uses lossy compression. Lossless compression reduces file size without any loss of data. PNG uses lossless compression.

Q3. What are layers? Why are they useful?

Layers are like transparent sheets stacked on top of each other. Each layer can be edited independently without affecting other layers. They are useful for non-destructive editing, combining multiple elements, and creating complex compositions.

Q4. Name any five tools available in GIMP toolbox.

Five tools in GIMP are: Rectangle Select tool, Paintbrush tool, Eraser tool, Text tool, and Crop tool.

Quick Revision Points

• GIMP stands for GNU Image Manipulation Program
• It is free and open-source software, Native file format is XCF
• JPEG = lossy compression, PNG = lossless compression
• Layers allow non-destructive editing
• Filters add special effects (Blur, Sharpen, Distort), Use Scale Image to resize, Crop Tool to crop, Always Export As to save in formats other than XCF

Practice using GIMP on your computer. The practical exam will require you to perform operations like cropping, resizing, applying filters, and working with text and layers. Hands-on practice is the best preparation.