Samacheer Class 7 Science - Visual Communication

Raster Graphics are created on the basis of PIXELS.
The photos taken by camera and the photos scanned by a scanner are of the Raster type.
When we enlarge this type of photos we could see the pictures as rectangular layers or grids.

Two-dimensional (2D) and three-dimensional (3D) pictures differ in the dimensions they represent and how they appear to our eyes. Two-dimensional images have only two dimensions: length and height. These images are flat and appear on a plane surface such as paper or a screen. Examples of 2D images include drawings, paintings, photographs, and diagrams. Three-dimensional images have three dimensions: length, height, and width, also known as depth. These images appear in front of our eyes similar to how objects appear in the real world, giving a sense of depth and space. 3D images can be created using various techniques such as stereoscopy, computer graphics, or physical models. When viewing 3D images, our eyes perceive the depth and spatial relationships between objects, making them appear more realistic and lifelike compared to 2D images. 3D images are commonly used in movies, video games, virtual reality, and medical imaging to provide a more immersive and realistic experience.

Raster graphics and vector graphics are two fundamental types of digital image formats, differing significantly in their construction and properties. Raster graphics, such as those in .png, .jpg, .gif, .tiff, and .psd file formats, are composed of a fixed grid of pixels. This means that when raster images are scaled up, they can lose quality and appear pixelated. Software commonly used for editing raster images includes Adobe Photoshop. In contrast, vector graphics are created using mathematical equations that define points, lines, and curves. This mathematical basis allows vector images, found in file types like .eps, .ai, .pdf, .svg, and .sketch, to be scaled infinitely without any loss of quality or sharpness. Popular software for creating and editing vector graphics includes Adobe Illustrator and Sketch.

Microsoft Photostory can be used to make videos using photos. First we have to upload
the photos and then select music for the video.
Step 1: Open the application of ‘Microsoft Photostory’. In that select ‘Begin A New Story’ and click on Next.
Step 2: Click ‘Import Picture’ in the next screen. Now, the files in our computer will appear. Select Saved pictures for video.
Step 3: Now we can input small text which is apt to the pictures. Then click on ‘Next’ and give animation to the videos. We can give audio effect also to these images. After finishing this click on ‘Next”.
Step 4 : To provide background music, we can select a music file through “Select Music” and click on “Next”.
Step 5: Next select a title for the story and select the place where it has to be saved in your computer. Then, through SETTINGS, change the format of the video.
Step 6: Now our video is ready to view. Click ‘VIEW YOUR STORY’. You can see your video now.