Which software is primarily used to create raster images?

Adobe Photoshop is primarily used to create raster images, which are made up of pixels. Unlike vector images, which use mathematical paths to define shapes and can be scaled without losing quality, raster images have a fixed resolution determined by the number of pixels in the image. Photoshop is specifically designed with tools and features tailored for editing and manipulating these pixel-based images, including brush tools, filters, and various editing capabilities that work best with this type of imagery.

In contrast, CorelDRAW and Adobe Illustrator are vector-based design programs used for creating graphics that can be easily scaled without losing clarity. InDesign is primarily a desktop publishing tool geared towards layout design and is not focused specifically on image creation. Thus, the unique capabilities of Photoshop make it the most suitable choice for raster image creation.