Textbook: Image Editing- Creating Collage | Computer Science for Class 7 PDF Download

 Page 1


Jyoti: I want to prepare a souvenir for my grandparents on their wedding anniversary. Tejas is 
helping me to do this. 
Tejas: Jyoti’s dad has given us photographs of her grandparents on a CD.        Removable storage       
Moz: You can create a collage or poster or booklet using these photographs.
Jyoti: I want to use these photographs and show some interesting events in the life of my 
grandparents. Let us make a collage.
Moz: A pictorial illustration is a good choice for your purpose.
CD/DVD, pen drive are removable storage devices, that an be used to transfer files between computers, and can be used to take backups.
Tejas: Let us list the steps for this task.
Jyoti: First, I need to select the photographs that 
show some interesting events of their lives.
Tejas: Second, arrange the photographs in a 
sequence of when these events occurred. 
Jyoti: These photographs can then be inserted 
into a collage.
Moz: I see that you are applying your knowledge 
of different thinking skills to decide the 
photographs to  be included.     Thinking Process Skills 
Tejas and Jyoti select some photographs.
Draw on your knowledge of thinking process skills, while working on any task or application. In the given example, dividing the task into a 
series of main and detailed steps and selecting a few photographs over others involves Step wise thinking and logical reasoning. 
1
2
1
2
Aim: In this lesson, you will learn:
- The different options and tools to edit an image.
- The different ways to change and/or add attributes of an image.
Image Editing: Creating Collage
3
Page 2


Jyoti: I want to prepare a souvenir for my grandparents on their wedding anniversary. Tejas is 
helping me to do this. 
Tejas: Jyoti’s dad has given us photographs of her grandparents on a CD.        Removable storage       
Moz: You can create a collage or poster or booklet using these photographs.
Jyoti: I want to use these photographs and show some interesting events in the life of my 
grandparents. Let us make a collage.
Moz: A pictorial illustration is a good choice for your purpose.
CD/DVD, pen drive are removable storage devices, that an be used to transfer files between computers, and can be used to take backups.
Tejas: Let us list the steps for this task.
Jyoti: First, I need to select the photographs that 
show some interesting events of their lives.
Tejas: Second, arrange the photographs in a 
sequence of when these events occurred. 
Jyoti: These photographs can then be inserted 
into a collage.
Moz: I see that you are applying your knowledge 
of different thinking skills to decide the 
photographs to  be included.     Thinking Process Skills 
Tejas and Jyoti select some photographs.
Draw on your knowledge of thinking process skills, while working on any task or application. In the given example, dividing the task into a 
series of main and detailed steps and selecting a few photographs over others involves Step wise thinking and logical reasoning. 
1
2
1
2
Aim: In this lesson, you will learn:
- The different options and tools to edit an image.
- The different ways to change and/or add attributes of an image.
Image Editing: Creating Collage
3
Moz: There are many applications available for editing images, like Gimp and mtPaint. Let us 
explore ‘mtPaint’ which is a simple image editing application with various utilities.  
Tejas: Ok. Let me double click the icon to start the application.
Jyoti: Let us use File-> Open option to open one of our pictures and explore the different  
options available.
Tejas: Let us see how to  change the colour in the pictures. I wonder if we can also add  
text to this picture.
Jyoti:  Can we select some portions of the image (picture) for the collage?
Moz: Yes.  These are part of the image editing features. 
Image editing concept
Concept
Image editing is typically done in two ways:
Changing the image by manipulating the attributes •	
like size, colour, contrast, etc. 
By adding new attributes like shapes, text or new •	
painting.
Moz:  Let us now see the first type of image manipulation. 
Jyoti: I want to remove the empty chairs and the cycle in this image. I want to retain the  
rest of the image. 
Moz: So you want to select a specific portion of the picture? You can use the ‘Crop’ utility. 
Jyoti: Some of the pictures need modification before we can use them in the collage. We need to 
use an application for editing pictures.
Skill
Crop an image
To crop an image: 
Click on the ‘Make Selection’ 1. 
icon from the toolbar.
Select the required portion of 2. 
the image.
From ‘Image’ option on the 3. 
menubar, select ‘Crop’ to 
crop the image. Only the 
selected portion is retained.
1
3
Selection
Icon
2
Page 3


Jyoti: I want to prepare a souvenir for my grandparents on their wedding anniversary. Tejas is 
helping me to do this. 
Tejas: Jyoti’s dad has given us photographs of her grandparents on a CD.        Removable storage       
Moz: You can create a collage or poster or booklet using these photographs.
Jyoti: I want to use these photographs and show some interesting events in the life of my 
grandparents. Let us make a collage.
Moz: A pictorial illustration is a good choice for your purpose.
CD/DVD, pen drive are removable storage devices, that an be used to transfer files between computers, and can be used to take backups.
Tejas: Let us list the steps for this task.
Jyoti: First, I need to select the photographs that 
show some interesting events of their lives.
Tejas: Second, arrange the photographs in a 
sequence of when these events occurred. 
Jyoti: These photographs can then be inserted 
into a collage.
Moz: I see that you are applying your knowledge 
of different thinking skills to decide the 
photographs to  be included.     Thinking Process Skills 
Tejas and Jyoti select some photographs.
Draw on your knowledge of thinking process skills, while working on any task or application. In the given example, dividing the task into a 
series of main and detailed steps and selecting a few photographs over others involves Step wise thinking and logical reasoning. 
1
2
1
2
Aim: In this lesson, you will learn:
- The different options and tools to edit an image.
- The different ways to change and/or add attributes of an image.
Image Editing: Creating Collage
3
Moz: There are many applications available for editing images, like Gimp and mtPaint. Let us 
explore ‘mtPaint’ which is a simple image editing application with various utilities.  
Tejas: Ok. Let me double click the icon to start the application.
Jyoti: Let us use File-> Open option to open one of our pictures and explore the different  
options available.
Tejas: Let us see how to  change the colour in the pictures. I wonder if we can also add  
text to this picture.
Jyoti:  Can we select some portions of the image (picture) for the collage?
Moz: Yes.  These are part of the image editing features. 
Image editing concept
Concept
Image editing is typically done in two ways:
Changing the image by manipulating the attributes •	
like size, colour, contrast, etc. 
By adding new attributes like shapes, text or new •	
painting.
Moz:  Let us now see the first type of image manipulation. 
Jyoti: I want to remove the empty chairs and the cycle in this image. I want to retain the  
rest of the image. 
Moz: So you want to select a specific portion of the picture? You can use the ‘Crop’ utility. 
Jyoti: Some of the pictures need modification before we can use them in the collage. We need to 
use an application for editing pictures.
Skill
Crop an image
To crop an image: 
Click on the ‘Make Selection’ 1. 
icon from the toolbar.
Select the required portion of 2. 
the image.
From ‘Image’ option on the 3. 
menubar, select ‘Crop’ to 
crop the image. Only the 
selected portion is retained.
1
3
Selection
Icon
2
Tejas: We need to reduce the size of the images to include in the collage. Suppose we want to 
reduce the size of this image.  Can we do it without losing some part of the image.
Moz: Yes. You can. This is called scaling of the image.
Jyoti: Look at the cropped image.
Jyoti: It would be fun to make some pictures look like they are very old. Can we convert a colour 
image to black and white image? 
Moz: Pictures in black and white are called grayscale images. These images are composed only of 
different shades of black. Explore whether grayscale option is available in mtPaint? 
Tejas: Yes. I found it! It is under the ‘Effects’ option on the Menubar.
Skill
Change the Scale of an image
From ‘Image’ option on the menubar, select ‘Scale Canvas’. 1. 
Explore these on your own.
(See activity on page 33.)
}
In the pop up window, enter the desired width and height of the canvas and click 2. 
OK. The canvas is set to the new size.
Jyoti: I clicked it..and see how the same picture looks in grayscale!
Page 4


Jyoti: I want to prepare a souvenir for my grandparents on their wedding anniversary. Tejas is 
helping me to do this. 
Tejas: Jyoti’s dad has given us photographs of her grandparents on a CD.        Removable storage       
Moz: You can create a collage or poster or booklet using these photographs.
Jyoti: I want to use these photographs and show some interesting events in the life of my 
grandparents. Let us make a collage.
Moz: A pictorial illustration is a good choice for your purpose.
CD/DVD, pen drive are removable storage devices, that an be used to transfer files between computers, and can be used to take backups.
Tejas: Let us list the steps for this task.
Jyoti: First, I need to select the photographs that 
show some interesting events of their lives.
Tejas: Second, arrange the photographs in a 
sequence of when these events occurred. 
Jyoti: These photographs can then be inserted 
into a collage.
Moz: I see that you are applying your knowledge 
of different thinking skills to decide the 
photographs to  be included.     Thinking Process Skills 
Tejas and Jyoti select some photographs.
Draw on your knowledge of thinking process skills, while working on any task or application. In the given example, dividing the task into a 
series of main and detailed steps and selecting a few photographs over others involves Step wise thinking and logical reasoning. 
1
2
1
2
Aim: In this lesson, you will learn:
- The different options and tools to edit an image.
- The different ways to change and/or add attributes of an image.
Image Editing: Creating Collage
3
Moz: There are many applications available for editing images, like Gimp and mtPaint. Let us 
explore ‘mtPaint’ which is a simple image editing application with various utilities.  
Tejas: Ok. Let me double click the icon to start the application.
Jyoti: Let us use File-> Open option to open one of our pictures and explore the different  
options available.
Tejas: Let us see how to  change the colour in the pictures. I wonder if we can also add  
text to this picture.
Jyoti:  Can we select some portions of the image (picture) for the collage?
Moz: Yes.  These are part of the image editing features. 
Image editing concept
Concept
Image editing is typically done in two ways:
Changing the image by manipulating the attributes •	
like size, colour, contrast, etc. 
By adding new attributes like shapes, text or new •	
painting.
Moz:  Let us now see the first type of image manipulation. 
Jyoti: I want to remove the empty chairs and the cycle in this image. I want to retain the  
rest of the image. 
Moz: So you want to select a specific portion of the picture? You can use the ‘Crop’ utility. 
Jyoti: Some of the pictures need modification before we can use them in the collage. We need to 
use an application for editing pictures.
Skill
Crop an image
To crop an image: 
Click on the ‘Make Selection’ 1. 
icon from the toolbar.
Select the required portion of 2. 
the image.
From ‘Image’ option on the 3. 
menubar, select ‘Crop’ to 
crop the image. Only the 
selected portion is retained.
1
3
Selection
Icon
2
Tejas: We need to reduce the size of the images to include in the collage. Suppose we want to 
reduce the size of this image.  Can we do it without losing some part of the image.
Moz: Yes. You can. This is called scaling of the image.
Jyoti: Look at the cropped image.
Jyoti: It would be fun to make some pictures look like they are very old. Can we convert a colour 
image to black and white image? 
Moz: Pictures in black and white are called grayscale images. These images are composed only of 
different shades of black. Explore whether grayscale option is available in mtPaint? 
Tejas: Yes. I found it! It is under the ‘Effects’ option on the Menubar.
Skill
Change the Scale of an image
From ‘Image’ option on the menubar, select ‘Scale Canvas’. 1. 
Explore these on your own.
(See activity on page 33.)
}
In the pop up window, enter the desired width and height of the canvas and click 2. 
OK. The canvas is set to the new size.
Jyoti: I clicked it..and see how the same picture looks in grayscale!
Moz: These are some of the options we have used for manipulating the image. Now explore 
options by which you can add other interesting things to the image. 
Jyoti: Some of the photographs have dates. I want to add these in the images. 
Tejas: We can also add some funny captions for some of these images.  Let us try the option:                 
       under Toolbar menu.
Skill
Adding text
Click on the ‘Paste text’ (        ) option on the toolbar. 1. 
In the displayed window, enter the text to be 2. 
inserted. Also select the Font, Font size and 
style. Then click ‘Paste Text’ button.
The typed text appears in the middle of the 3. 
image.
Move the text box and place it where you 4. 
want. Then either right click the mouse or 
press the ‘Enter’ key on the keyboard. The 
text is now placed in the  desired spot.
 
Tejas: Let us add more kites to this photograph of you and your grandfather flying a kite.  
It will look more colourful.
Moz: Apart from inserting text, you can also add shapes in images.
Page 5


Jyoti: I want to prepare a souvenir for my grandparents on their wedding anniversary. Tejas is 
helping me to do this. 
Tejas: Jyoti’s dad has given us photographs of her grandparents on a CD.        Removable storage       
Moz: You can create a collage or poster or booklet using these photographs.
Jyoti: I want to use these photographs and show some interesting events in the life of my 
grandparents. Let us make a collage.
Moz: A pictorial illustration is a good choice for your purpose.
CD/DVD, pen drive are removable storage devices, that an be used to transfer files between computers, and can be used to take backups.
Tejas: Let us list the steps for this task.
Jyoti: First, I need to select the photographs that 
show some interesting events of their lives.
Tejas: Second, arrange the photographs in a 
sequence of when these events occurred. 
Jyoti: These photographs can then be inserted 
into a collage.
Moz: I see that you are applying your knowledge 
of different thinking skills to decide the 
photographs to  be included.     Thinking Process Skills 
Tejas and Jyoti select some photographs.
Draw on your knowledge of thinking process skills, while working on any task or application. In the given example, dividing the task into a 
series of main and detailed steps and selecting a few photographs over others involves Step wise thinking and logical reasoning. 
1
2
1
2
Aim: In this lesson, you will learn:
- The different options and tools to edit an image.
- The different ways to change and/or add attributes of an image.
Image Editing: Creating Collage
3
Moz: There are many applications available for editing images, like Gimp and mtPaint. Let us 
explore ‘mtPaint’ which is a simple image editing application with various utilities.  
Tejas: Ok. Let me double click the icon to start the application.
Jyoti: Let us use File-> Open option to open one of our pictures and explore the different  
options available.
Tejas: Let us see how to  change the colour in the pictures. I wonder if we can also add  
text to this picture.
Jyoti:  Can we select some portions of the image (picture) for the collage?
Moz: Yes.  These are part of the image editing features. 
Image editing concept
Concept
Image editing is typically done in two ways:
Changing the image by manipulating the attributes •	
like size, colour, contrast, etc. 
By adding new attributes like shapes, text or new •	
painting.
Moz:  Let us now see the first type of image manipulation. 
Jyoti: I want to remove the empty chairs and the cycle in this image. I want to retain the  
rest of the image. 
Moz: So you want to select a specific portion of the picture? You can use the ‘Crop’ utility. 
Jyoti: Some of the pictures need modification before we can use them in the collage. We need to 
use an application for editing pictures.
Skill
Crop an image
To crop an image: 
Click on the ‘Make Selection’ 1. 
icon from the toolbar.
Select the required portion of 2. 
the image.
From ‘Image’ option on the 3. 
menubar, select ‘Crop’ to 
crop the image. Only the 
selected portion is retained.
1
3
Selection
Icon
2
Tejas: We need to reduce the size of the images to include in the collage. Suppose we want to 
reduce the size of this image.  Can we do it without losing some part of the image.
Moz: Yes. You can. This is called scaling of the image.
Jyoti: Look at the cropped image.
Jyoti: It would be fun to make some pictures look like they are very old. Can we convert a colour 
image to black and white image? 
Moz: Pictures in black and white are called grayscale images. These images are composed only of 
different shades of black. Explore whether grayscale option is available in mtPaint? 
Tejas: Yes. I found it! It is under the ‘Effects’ option on the Menubar.
Skill
Change the Scale of an image
From ‘Image’ option on the menubar, select ‘Scale Canvas’. 1. 
Explore these on your own.
(See activity on page 33.)
}
In the pop up window, enter the desired width and height of the canvas and click 2. 
OK. The canvas is set to the new size.
Jyoti: I clicked it..and see how the same picture looks in grayscale!
Moz: These are some of the options we have used for manipulating the image. Now explore 
options by which you can add other interesting things to the image. 
Jyoti: Some of the photographs have dates. I want to add these in the images. 
Tejas: We can also add some funny captions for some of these images.  Let us try the option:                 
       under Toolbar menu.
Skill
Adding text
Click on the ‘Paste text’ (        ) option on the toolbar. 1. 
In the displayed window, enter the text to be 2. 
inserted. Also select the Font, Font size and 
style. Then click ‘Paste Text’ button.
The typed text appears in the middle of the 3. 
image.
Move the text box and place it where you 4. 
want. Then either right click the mouse or 
press the ‘Enter’ key on the keyboard. The 
text is now placed in the  desired spot.
 
Tejas: Let us add more kites to this photograph of you and your grandfather flying a kite.  
It will look more colourful.
Moz: Apart from inserting text, you can also add shapes in images.
Moz: One way to introduce this is by using the ‘Smudge’ option on the toolbar. When you use this 
option and drag the cursor, the colour in that area is smeared or blurred.
Jyoti: Wow! Now the picture is full of life with ‘Smudge’ effect. It looks as if I was running  
in a competition. 
Moz: Yes. There are many such tools like flood fill, draw straight lines, draw and fill shapes which 
can be used to bring life to your images. Now that you are done with the editing of the images, 
save them.
Jyoti:  If I press ‘Ctrl+S’(to save the image) now, it will overwrite on the original image, and I will 
lose the original image. So let us save this image using ‘Save as’ which allows us to change the 
filename and also retain the original image.      Files: Saving, Naming
Moz: Good thinking Jyoti! Alternatively, you could have also made a copy of the original image 
with another file name before you started editing this image.  
Tejas: While saving, under the ‘File Format’ option, I see so many options like GIF, PNG, JPG, 
TIFF. Which file format should we use to save the image?
Moz: Similar to the  text documents (saved with different extensions like .odt, .doc) images can be 
saved in different formats with extensions like .jpg, .tiff, .png. 
Tejas:  mtPaint by default saves the image with .jpg extension.
Moz: Images saved in jpg format are recognized by most applications. You can try saving in 
different formats and check how they look on the screen.
Tejas: We have a picture of Jyoti when she was two years old, running away with grandma’s glasses. 
Let us  make this image more interesting. Can we add some speed lines to make her look like she 
is running fast?
Skill
Adding shapes to the image
From the toolbar, choose either ‘Make Selection or Polygon Selection’ button (             ) 1. 
Select the area in the image where you want to insert a shape using the mouse. 2. 
Now click the desired shape from the toolbar. 3. 
The	selected	area	is	filled	with	the	clicked	shape. 4. 
To record content created or modified on a computer, save in a file with a suitable name. A file naming convention of your own helps in 
identifying the file to retrieve later.  Consider content in the file,  date of creation of the file,  and version of the file while naming a file. 
Example: Bday_invite_12oct11.jpg, scprj_Feb11_ver1.odt. 
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