An image is a binary representation of information, such as Pictures, Graphics, logos, etc.


  • Size
  • Colour
  • Depth
  • Image Resolution


The digital size of the image is measured in kilobytes, megabytes, or gigabytes. The size of the file is proportional to the pixel dimensions of the image. Images that have more pixels produce a more detailed picture at a given printed size, but they require more disk space to store and can take a long time to edit and print. 

For example, a 1*1 inch 200 PPI image has 4 times more pixels than a 1*1 inch 100 PPI image and their file size is also 4 times. Therefore image resolution becomes a middle ground between image quality and file size. Other factors that affect file size are GIF, Due to the different compression methods used by the JPEG and PNG file formats, the file sizes can be different for the same pixel dimensions. Similarly, the bit depth of the colors of the image and the number of layers and channels also affect the size of the file.


Each Adobe Photoshop has one or more channels. Each channel stores information about the color elements of the image. The number of channels available by default in an image depends on the color pattern. For example, a CMYK image has at least 4 channels. A separate plate is designated for the plating layer of the printing process for information related to Cyan, Magenta, Yellow, and Black. 

In addition to these default color channels, some additional channels called alpha channels can also be added to the image. Used to store and edit color selection masks, as well as add spot color channels to add spot color plates for printing.


Bit depth is also called pixel depth, color depth, simply depth. It measures how much color information is available to display or print each pixel in an image. Higher bit depth means that more colors are available in the image and the display of colors on digital images will be more proper. For example, a pixel whose bit depth is one has two possible values ​​black and white, a pixel whose bit depth is 8 has 28 or 16 million possible values.

Image Resolution

The number of pixels displayed per unit of printed length of an image is measured in terms of pixels per inch. In Photoshop, you can change the resolution of the image. In Photoshop, the resolution and pixel dimensions depend on each other. 

The amount of detail of the image depends on the pixel dimensions, while the resolution of the image controls how much of the pixel is printed. will go Let us now give an example you can change the resolution of the picture without changing the actual pixel data in the picture you just need to change the printed size of the image on the other hand if you want to preserve the same output dimension then A change in the resolution of an image calls for a change in the number of pixels when printed,

 an image that has a higher resolution than an image with a lower resolution Stores larger and smaller pixels in size. For example, a 1* a 1-inch image whose resolution is 72 PPI contains 5184 pixels, the same image includes 90000 pixels at 300 PPI resolution. A higher resolution image is generally more detailed than a lower resolution image.


I am an engineer by profession but being a blogger is my old day's dream to create my site for those who are more curious about my birthplace than I am coming from (India). the current city lives in Navi Mumbai, India

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