Are Pixels The Same As Dpi

By | 15/10/2022

You may have come up across the terms Dots Per Inch (DPI) and Pixels Per Inch (PPI) when describing digital image resolution.

Although the terms are used interchangeably, they are some key differences between DPI vs PPI:

  • DPI is the number of printed dots within 1 inch (ane″) of an image printed by a printer.
  • PPI is the number of pixels within ane inch (1″) of an image displayed on a computer monitor.

Understanding the departure between DPI and PPI is fundamental to photographers or anyone who needs to print out a digital photo.

This guide will help explain everything so you tin can exist confident nigh scanning or press your photos.

PPI Resolution Explained

What does PPI mean?

PPI stands for pixels per inch. To understand what PPI is, let’s start by explaining what a pixel is.

A digital paradigm is formed past tiny squares chosen pixels that contain only one color. When y’all zoom out or stand farther abroad, you finish seeing the pixels and run across the image every bit a whole.

If you multiply the number of pixels from the epitome width by the number of pixels from the image height, you’ll know the total pixel count, which gives you lot the paradigm’s resolution.

For example, if you have a digital image size of 6960 px by 4640 px, it means that you have a 32.5-megapixel image. You can spread those pixels in whatever fashion you desire and modify the photo’s physical size.

And then, if you were to put 300 pixels per inch (i.e., 300 PPI) yous would have a printed epitome that’s 23.2 10 xv.iv inches. If instead, yous fix it at 150 PPI, then the printed paradigm would be twice the size.

Then, what y’all’re doing is changing the pixel density and not changing the number of pixels of the digital image. You can use any photo editing program to come across how many pixels in that location are in your photo.

For example, in Photoshop, y’all need to go to the menu Paradigm > Prototype size. Here you’ll meet the Pixel Dimensions, which tells you the number of pixels on the width and height. The total amount of pixels is under Prototype Size, which is expressed in MP (megapixels).

If y’all want to change the PPI, I’ll explain how to do it in a defended section farther down in the article.

When should yous use PPI?

You should employ PPI when you lot’re working with a digital image that’s related to physical back up – like a monitor or a impress.

In the previous section, I explained how PPI determines impress size – by having the pixels closer together, the paradigm is smaller than it would be if you spread the pixels farther apart from each other.

Nevertheless, you lot tin also utilize PPI when you’re talking about a display screen. For instance, the MacBook Air 13.3″ Retina Brandish has a 2560 x 1600 screen resolution with a 227 PPI.

How to change your PPI

If you want to resize images, yous are changing the PPI. This is OK if you’re downsizing – which means that you put more pixels per inch to achieve a smaller image size.

However, upsizing is non advisable considering you’ll commencement to lose image quality, and y’all might cease upwards with a pixelated image. If yous really demand a bigger image size, you can use dedicated software like
Topaz Gigapixel AI
to increase the image dimensions up to 6x.

Simply open your image file and determine the new size. You can do it past scaling to 0.5x, 2x, 4x, 6x, or custom – or you lot tin utilise width and tiptop.

If y’all choose the latter, input the new size in pixels, inches, or centimeters, and set the desired PPI. You can also adjust the “Suppress Racket” and “Remove Blur” features for a improve result. It’s as well possible to resize multiple images at a time – come across our Gigapixel review to acquire more most what it can do.

If you don’t want to spend money on a defended program, well-nigh image editing software can upscale pixel resolution, merely not all of them are good at preserving image item.

For example, in Photoshop, y’all demand to get to the menu Image and select Prototype Size. In the pop-up window, input the new size values, check the “Resample” box, and cull “Preserve Details (Enlargement)” from the drop-down card. In that location are different resampling methods, so feel costless to try others and see which ane gives y’all the best issue.

Y’all can besides utilize the Enhance feature in Lightroom or Adobe Photographic camera Raw (ACR) to double the size. Yous tin can access ACR by opening a raw file in Photoshop. You tin can likewise choose to edit a file in ACR from Adobe Span or utilize the ACR filter from within Photoshop.

What is the Best PPI for Scanning Photos?

The best PPI depends on the size of the photo you’re scanning and how you’ll use it once it’s digital.

In most cases, y’all should be OK scanning at 300 or 600 PPI if y’all desire to accept high-quality prints. However, yous should consider the size of the original image and the final image size that yous’re looking for.

Let me give you lot an example. If y’all desire to scan a postcard to make a impress of the same size, y’all demand to scan it at 300 PPI. However, if you lot’re going to impress it at 8″ past 10″, you’ll need to scan it at 600 PPI. This is because a postcard’s size is 4″ by 6″.

On the other mitt, 72 PPI or 96 PPI should be enough if you’re scanning for web images. Just make sure to invest in one of the all-time photo scanners or find the best online photo scanning service and so that you’re creating the all-time quality archives and photo prints.

DPI Printing Explained

What does DPI mean?

DPI refers to how many ink dots a printer can print per inch – therefore, DPI ways dots per inch.

The DPI and PPI don’t have to be the same. For example, you tin send to the printer a 300 PPI photo – which is a high-resolution photo. Then, the printer can have a higher DPI setting, let’s say 600, to improve the quality.

Each printer has its ain unique DPI that depends on the brand, the model, and the type of printer. This means that the tiny dots of ink on each printer can have different sizes and patterns. The printing speed tin as well tiresome down to allow overlapping of the dots.

Inkjet printers range between 300 and 720 DPI, while light amplification by stimulated emission of radiation printers range between 600 and 2400 DPI. Because they are unique, it’s difficult to rate the quality based only on the resolution. For example, it might exist that the aforementioned photo printed on a 600 DPI resolution printer looks better than one printed on a 720 DPI printer.

Another matter that can affect the prototype quality of your print is the blazon of paper that you lot use. For case, some papers tin can create bleeding. Too, images printed on a glossy surface look sharper than those printed on canvas due to their texture.

When should y’all utilise DPI?

Yous should use dots per inch whenever y’all print a digital image. As well, scanners have the optical resolution expressed in DPI -even though they are referring to a digital document.

What DPI should I scan 35mm negatives?

Though scanners will tell you lot their DPI capabilities, PPI is really the well-nigh relevant factor to consider for digital scans.

To make up one’s mind the best PPI for 35mm negatives or slides, y’all need to consider the print size that y’all desire to become from information technology.

If you want to scan a 35mm negative to brand a print that’southward 5″ x 7″, you need to scan it at 1500 PPI. This is because 35mm film is roughly i″ by 1.5″. So, to have 300 pixels per inch, you lot demand a 1500 PPI scan.

DPI vs PPI: How Practice They Chronicle to Each Other?

When you lot think about PPI vs DPI, yous should retrieve that you’re talking near digital versus print. The DPI and the PPI relate when y’all want to impress digital images.

The PPI determines the print size considering you accept a limited amount of pixels on your epitome – so a greater pixel density means that the print will have enough details and sharpness.

If you use a photo with too few pixels, not even the best photograph printers can deliver good print quality. So, for a higher quality print, you need to use a digital file with a high PPI.

What is the Maximum Size I Can Print a Photo?

The concluding print size depends on the image resolution. A higher resolution can handle a large impress, while a depression-resolution photo would be pixelated if you tried to enlarge it.

To make up one’s mind how big you can print a picture, outset by checking its resolution – in other words, its total pixel dimensions. Then, separate information technology by 300, which is the ideal PPI for printing.

Allow’s say you lot have a photograph that’s 6960 px by 4640 px, which is the size of an epitome produced past the Catechism 90D. Then yous tin print it equally big as 23.ii x xv.four inches.

However, if you don’t need the highest quality, you can lower the PPI and make it bigger. Check with your press lab on how to optimize your digital images for the specific employ that yous want to give them.


DPI vs PPI: FAQs

Is 300 PPI the same as 300 DPI?

They’re ofttimes used interchangeably. However, technically they aren’t the same thing – 300 PPI refers to a digital image or a estimator screen while 300 DPI refers to a physical printer.

Is 300 PPI loftier resolution?

Yes, 300 PPI is considered a loftier-resolution photograph, and it allows for good quality prints.

Is 300 or 600 DPI amend?

Technically speaking, 600 DPI means more than dots per inch – hence, more than details. However, the picture quality is non based only on the resolution. Also, depending on how far away you’ll see the flick, you might not fifty-fifty notice the difference. For example, billboards are often printed at 30 DPI, and they await perfectly OK.

Should I scan photos at 300 or 600 DPI?

Information technology depends on the photo’s original size and the concluding size you lot want to impress. If you lot’re going to continue them in the same size, you can scan them at 300 PPI. If y’all’re going to enlarge them, then opt for 600 DPI or more.

Image Quality vs Digital Prototype Size: Last Words

Equally you tin see, DPI and PPI are not the same things. However, they’re often used as if they are – which leads to a great bargain of confusion.

I hope I was able to clear things upwards so that you tin adequately determine which PPI and DPI you need when you desire to scan, impress, or display your photos.

If yous have any questions or tips on handling pixel density and printer dots, delight share them with us in the comments section.

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Source: https://shotkit.com/dpi-vs-ppi/