An image appears perfect on the computer screen but loses quality when printed on paper. We’ve all been in this situation at some point in our lives. The question now is, why does this happen?
Until now, we have seen the importance image resolution holds in an image. But what exactly is it? The file size of an image chiefly depends on a factor called “image resolution.” Resolution determines the quality of an image, be it on a digital screen or paper.
When a digital image is printed on paper, its file size gets compressed. Putting it simply, the image quality reduces. So, while working on any project, it is very important to be aware of the image’s resolution. Otherwise, the final output might not be as expected.
What is image resolution?
Image resolution refers to the degree of detail contained in an image. Every digital image is made up of tiny squares called pixels, the basic unit in a digital display, or dots printed on paper.
Together, several of these small squares or dots form the bigger images we see.
The number of pixels per inch of the digital display gives the value of an image’s resolution, also called PPI or Pixels Per Inch. So, the higher the number of pixels in 1 inch, the higher the resolution, and vice-versa.
The pixels vary in size. Since the image resolution depends on the number of pixels in 1 inch of digital display, the smaller the pixel size, the more pixels it can accommodate in 1 inch. Hence, the higher the resolution and vice-versa.
The number of ink dots printed physically on 1 inch of paper is called DPI or Dots Per Inch. So, the higher the number of dots per inch of a paper, the higher the resolution of the printed image, and therefore better the print quality and vice-versa.
Also, the higher the DPI of the printer, the higher will be the resolution, and so better will be the printing quality and vice-versa.
PPI vs DPI
PPI and DPI are mostly used interchangeably for image resolution as 1 DPI = 1 PPI. But there’s a fine line of difference between the two.
DPI is the resolution of the printing device, which tells about the number of dots the printer can print per inch of paper.
On the other side, PPI is the pixel count in 1 inch of digital display, which changes with the size of the photo.
The DPI of the printer should be nearly equal to or more than the PPI of the digital image to get a good quality print of the digital image.
The images are classified as high and low resolution depending on the number of image pixels. Now let’s see what high and low-resolution images actually are.
What is a low-resolution image?
The images with fewer pixels per inch of the digital display are called low-resolution images. Sometimes, we also call them low-PPI images. Any image with fewer than 300 pixels per inch is a low-resolution image. 72 PPI is standard for the Internet; the lower the number of pixels, the smaller the file size and the faster it will load.
However, the low pixel count is not the only factor that makes an image’s resolution low. The big size of the pixels also can give rise to low-resolution images. As mentioned above, the bigger the size of the pixels, the less will be the number of pixels in 1 inch of display and, therefore, the lower will be the resolution of the image.
In the case of printing, anything lower than 300 DPI is considered low-resolution or low-DPI images and gives a low-quality print on paper.
Low-resolution images are visibly less sharp, and sometimes the pixels are clearly visible if the pixel size is large.
What is a high-resolution image?
High-resolution images have more pixels per inch of digital display space. We also refer to them as high-PPI images. A high-resolution image has more than equal to 300 pixels per inch.
The small size of the pixels is also considered for the image’s high resolution besides the high pixel count. As mentioned earlier, the smaller the pixel size, the more pixels will be in 1 inch of display, and therefore, the higher the image’s resolution.
In the case of printing, 300 DPI and more are considered high-resolution or high-DPI images.
High-resolution images are clearer and sharper, with a very high level of detail, and give the best viewing experience on screen as well as on paper.
Note: All of these resolutions mentioned above will appear good on the digital screen (of course, with some level of difference in the sharpness). But only 300 PPI (or 300 DPI) can give the best quality print.
Converting low resolution images to high resolution
In many situations, we feel the need of converting low-resolution images to high-resolution for various uses. Several online tools are available to give you the desired image output quality. Besides these, professional image editors like Photoshop, Snapspeed, and Picsart are also the go-to choice of professional editors.
To sum up, high and low image resolution is something to look for based on the image’s purpose. As for e-commerce, real estate and other business purposes, high-resolution pictures are a mandate as they will showcase the features of the products in utter detail.
On the other hand, professional photographers use the type of image resolution based on their requirements. For instance, a high-resolution wildlife image with utmost precision will grab more eyeballs in an exhibition.
Professional photo editors use high-end photo post-processing techniques to change the image resolutions as per the requirement of their clients.
Hope this blog comes in handy to the fellow readers. Stay tuned for more!