How to understand DPI and PPI correctly - Easy Beginners Tutorial / Worst Myths cleared up
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- เผยแพร่เมื่อ 20 พ.ค. 2024
- How to understand DPI and PPI - This Easy Beginners Tutorial will help you clean up the Worst Myths.
How to decide the Print DPI? Why use 72 DPI? Why use 96 DPI? What is the differnce between DPI and PPI? Are PPI and DPI the same? Does higher DPI give better image Quality? How to export in 300 DPI? What DPI is right for print?
Also Checkout this Video by PiXimperfect:
• PPI is Imaginary! PPI ...
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00:00 Intro
00:20 The biggest DPI Myths
01:04 How big is a Pixel
01:34 How does DPI work
02:06 What is Resolution
02:37 How to set DPI and PPI
04:54 Does lower DPI mean lower Quality
05:23 Why 72 DPI - the Web Myth
06:24 Does every Print need 300 DPI
09:02 Does and Print Surface
09:26 Print PDF DPI Setup
13:23 The most important Points
what's dpi
what is dpi
who does dpi work
difference between ppi and dpi
what is ppi
dpi meaning
dpi print size
dpi vs ppi
right dpi
wrong dpi
best dpi
correct dpi
dots per inch
pixels per inch
screen dpi
screen ppi
print dpi - แนวปฏิบัติและการใช้ชีวิต
I'm going to watch this several times... In fact probably every time I'm going to make a print. Thank you for this wonderful tutorial
My pleasure. Thank you very much :)
Before I retired from the printing industry I worked with Photoshop, InDesign etc. A recurring issue would be when we received a low res (72dpi) image placed in a document using InDesign or something similar. The customer would enlarge the image say 200 percent. So what they were effectively doing is printing a 36 dpi image
that is then rasterized to 300 for print. Of course the image would look like garbage. But but...the image is 300 dpi! It should look beautiful! You need to remember that when you enlarge/resample an image you are NOT adding information. Just adding pixels. The greater the output size the worse the quality. In other words, don't take a 1 inch by 1 inch 72 dpi image and expect to fill a 8 x 10 without severe loss of quality. My head hurts...going back to my couch.
Yes, that's exactly what i'm saying in this video: The pixel count must be at least high enough to over the size and dpi you wish to print ;)
It's been many years since I worked in the industry (Quark was still the standard), the rule was the required LPI (Lines Per Inch) of the printed material (in the case of newsprint, as low as 60 lpi) dictated the image resolution required, 1.5 - 2 x the linescreen. In the case of newsprint, that meant only 120dpi at the output dimensions. For glossy magazines, often they used something like 120 lpi screens, so a resolution of 240dpi at the output dimensions. Only fine art prints generally used 150dpi, requiring 300dpi. All that assumes screened images, not lineart. Lineart is much higher, 1200dpi or the like, whatever the resolution of the output device could handle. Domestic laser printers and inkjets are a different matter. Inkjets don't print using screens. Also, as Olivio mentioned, billboards are low resolution, as they're viewed at distance.
This has always been a confusing subject, you have covered it beautifully. I need to go back through this a few times and clarify some terms. Thank you very much.
Thank you very much. Let me know if you have any questions - best in my facebook group, because here I often don't see replies to a reply I wrote
Whoever has invented imperial measurements system, and whoever integrated the impedial measurements system into android or any kind of computer is clinically insane and has to stay in an asylum until he dies. It's very clear this has only been invented to confuse people and to make developers who wrapped their head around it appear more "clever" than others.
There are hundrets of ways how this could have been done easier, especially without the imperial measurements system.
When I see the way most sellers talk to their customers when selling smartphones, I can't believe how degenerate most of this world has become in the recent years. In most situations, neither the seller nor the customer understand anything about this, yet the seller takes an awkward wannabe elegant body posture trying to overplay his retardation. And this is also where the problem is. This system only exists to have a higher amount of sales becouse electronics seem more "magical" if they get missunderstood by the majority of the public.
What a load of shit from start to end.
How did this even make it through to become market standart?
This video will be saved and I'll watch this once a week until it all goes in! Great work explaining the subject and for the 'Myth busting' Brilliant as always Olivio.
Thank you very much. This video was a lot of work too. Makes me very happy you enjoy it so much :)
Thank you Olivio, that was brilliant.
Thank You Olivio for clearing that up
My pleasure :)
Awesome info Olivio! Thanks, Ron...
Thank you very much :)
glad I retired 22 years ago. this is one area where I am always confused and likely will remain so simply because I don't normally print image but prefer to view them on a 27" monitor at maybe 15-18-30" based upon where I sit to view the result of an edit and of course with my poor eyesight which pair of glasses I wear at what time of day based upon when I last had a nap. Three different pair used throughout the day/night. Good thing I can see and hear enough to enjoy Olivio's tutorials.
Thank you, this is very helpful.
You are welcome :)
Very interesting again! Thank you Olivio! Greetings from Meidling!
Thank you very much :)
Ferstel Passage in Wien !
On another note, that shirt is so cool!
Whats ur favorite settings for prints, cards, etc.?
Since printer print with fixed dots the more dot you have for a pixals the more dots you have for shades of that color. That one reason for 300 dpi (depending on the screen line size) the more shades you can make for that color. If for example if you have a 10 dot per line screen that will give you 10 shades of that color plus all white (no dot) all 10 will be max color.
I think you meant to say "the more dots you have per inch" not per pixel. I'm not sure what you mean by "screen line size". Are you still talking about a print at that point or about a screen?
@@OlivioSarikas He probably meant pixels per inch. The number of dots varies per pixel according to the density of colors in each pixel. And there is nowhere you can set it.
In the old days the screens (a piece of film with holes in it)where listed by line of dots in a inch those screens made dots of different sizes depending on how bright the light hitting it. Now all dots are the same and it's how many dots are used to make the same, so the more dots you have to work with the more shades
Also there was a pattern that the screen made for each color so the screens had to laid over your plate film at certain angles to prevent Moray pattern it was called a rossetta pattern
Also still used in non digital offset presses
Im done. Jesus effing christ, Im glad you could help someone. Maybe its frustration at having watched so many of these and not having the answers that Im looking for...
I see why there are so many positive comments now :D
I went to all the comments and now know why I don't understand it and likely never will and probably won't need to and darn if I don't need a nap.
When developing a RAW in AP the file comes out by default at 72 dpi. I haven't found any method to change this other than resampling. I understand that from what you say, if I put the developed file in a 300 dpi document when exporting, can I get a Jpeg at 300 dpi?
DPI does not exist in digital documents! Only the width and height. Even if you have any documents size or formats in 600dpi saving or exporting to a png file it will always say 72dpi or 72ppi. The DPI is a code in a file that tells the hardware (printer drivers) that you want the ink to be printed in a tight or wide paper. DPI or PPI is a imaginary number. You never never save any files thinking in DPI and yes in width and height. 300 DPI is roughly 1000 pixels wide. 1 inch = 300 pixels, so a 4” x 6” image requires 1200 x 1800 px to print at 300 dpi.
@@InteractiveDNA I think we need a cheat sheet of all the combinations one would need to make prints from 2 x 2 to 40 x 60. OS -- are you game to create such a thing or you IDNA? Love the name. I have a sculpture of a Gnome at my front door and I named him Mr. DNA and ask people if they know why. They don't so I tell them that he is a "human's G nome"
Do you ever find when you edit photos on a computer and then post them to social media that they appear much darker when viewed on a cell phone?
Usually brigther on my phone, but every screen looks a bit different. Maybe your computer screen is too bright or the smartphone screen too dark. also make sure you export the images in sRGB and maybe buy a moitor calibration device to get your screen closer to the "real" color values
As slow and simple as you made this, I STILL feel unsure and need to rewatch.
Don't worry. It's a hard topic to unravel. That's why most schools simple teach 27 dpi and 300 dpi and be done with it. And in most cases that works. This is more like a "how does it actually work" kind of video ;)
I always set output DPI at 300 as I don't output to other devices or the web. Any I output are to print on photo paper. I just create the document the size in inches I need and make sure that any image I use has the required px.res. ie 5inch x 5 inch and image at least 1500 x 1500. Someone told me I was wrong to do that and I should set 72dpi as the printer would print at 300dpi anyway. I tried to point out that if I had an image 1inch by 1inch (300px x 300px) and the dpi was set at 72dpi AP would calculate the output size as 4.167 inches x 4.167 inches and I still would have to alter the output dpi to 300 otherwise my printer would use the dpi of 72 and print 4.167 x 4.167. To me it made sense to create the document at the size & dpi it was to be used at. He said I didn't understand and I was wrong. AP creates its paper sizes at 300dpi, He wanted me to change it to 72, create the document, complete the document then change it back to 300 before printing. He couldn't understand that was a waste of time. Would you agree with my method?
I don't understand why he thinks changing the DPI to 72 and back to 300 would be nessesary. If you want to create a print at 300 DPI, it makes sense to create 300 DPI canvas and then edit all the images you need in there by placing them or dragging them in. As I show in my video it does not matter what DPI the images you place in the canvas are, as long as the pixel resolution is big enough. AP with then convert them to one 300 DPI document at export for you :)
@@OlivioSarikas Thank you, I have researched dpi many time and was sure I was understanding it till he virtually called me an idiot who didn't know what I was talking about. In the end I just ignored him.
@@norman137 Don't worry about people like that. they are the equivalent of DPI Flatearthers. They heared some stuff and now are hellbend about being correct about it
I always tell people to NEVER ask for a dpi image or design from anyone. Always ask for the pixel dimensions. DPI or DPP is a virtual number in a computer. You go it wrong about pixels, pixels do have a size in a virtual world and it matters. There are square and rectangular virtual pixels in video, choosing the wrong one will affect the final dimension of the video. What matters in digital resolution is the resolution in dimension and not the dot per inches or pixels per inches. They are a imaginative concentrated compressed dots. When comes to designing choosing the right pixel size in your document is important and the resolution in dimension of the canvas. People also gets SUPER confused about resolution and definition of a video or image. Video resolution is the size of the canvas and video definition are the fine details of an image in a canvas. High density displays will provide better video or image definition because it has more physical pixels count in a display, the higher the better. Another way of saying this asking about dpi image is like saying can I get a kilo of e-mails? Good in there! good job!!! Only the pixel thing you got it wrong.
You forgot to mention rpi in this context. rpi is the recorder element. this is the maximum resolution of a printer. For example, the printer prints at 300 dpi and each point of this dpi value is composed of a certain number of recorder elements in a halftone raster.
Basically, Affinity Photo shouldn't display DPI but PPI, because the pixels have to be converted into dots when printing. This requires RIP software (Raster Image Processor).
I don't think RPI are relevant to my audience, because not even wikipedia has a RPI entry and I couldn't find anything about that on google relating to dpi or ppi. You are somewhat right about ppi being more important. however a pixel always needs to be converted from or into. A display also doesn't have pixels and needs to be converted to the tech that screen is using. equally a camera sensor doesn't have pixels, the raw data is converted to pixels when you process the raw into a actual pixel format. before that it's just sensor data. but all of that is too specific.
What's about website graphics dpi? Website graphics closer to our eyes so it should be high dpi
The screen has a maximum resolution it can display. Is your screen 8K, 4K or 1080p? That is much much pixels it can show. The dpi setting in the file have nothing to do with that. Only the pixel ammount of the file. So check if the image has at least 1920 x 1080 pixels to fill a 1080p screen for example. You can zoom in closer, but you will see the indivitual pixels in that case
@@OlivioSarikas Got it. When i use gradient in creatives design, on some screen it is ok and on some it is pixelated. May be that is the reason
Both the 72 dpi and the "Retina display" thing are marketing stuff from the Apple bubble. None of them has any real meaning at all. The 72 dpi thing was when your document was zoomed to the right level, the sizes onscreen would be the same as the sizes when printed. Or something along those lines. The monitors those days did not even use pixels.
Regarding retina - any screen, from a watch to billboard size - is retina when viewed from the correct distance. That is all.
ppi = pixels per inch
dpi = dots per inch (dots of ink from the printer)
ppi and dpi are not really interchangeable values.
First of all: DPI are not literally "dots of ink". There are different print methods and even then a single pixel is made up of different ink colors. That's why we have CMYK and not Millions of Inks. Secondly, I say in my video that PPI are for the screen and DPI are are for print, BUT a 300 dpi image is also a 300 PPI image. So yes, as far as it concerns the file they are exactly the same. That's a fact, no matter if you believe it or not. Oh, by the way, let me blow your mind: Neither a Screen nor your camera Sensor have actual Pixels. That's why the screen has RGB: 3 colors per pixel and your camera sensor records raw data that is only converted into pixels later, either in your camera or in raw development
@@OlivioSarikas Sorry, you are wrong. I love your videos, but as teachers, we are obligated to use the correct terminology.
Unless you are a programmer of printer drivers, dpi is completely irrelevant. Yes, there are different printing methods. Some use dots, some don't. But when you are printing with dots, it is still pixels that gets measured out per inch. The printer driver will then take your image, and based on the color density of each pixel in your file, it will decide how many dots that will be printed (and what color) for each pixel. So the only way you can influence how many dots there will be is by editing your image.
It is actually pretty easy. Think about a printer with only black. Unless you have a printer driver that decides how many dots that goes into each pixel, you would get a pretty coarse image as a pixel would only be either black - fully filled in, or white - no dots printed (I am assuming white paper). To really get a good greyscale, you would need 255 different inks for an 8bit image.
This is a recurring theme with Affinity, because someone there is too proud to admit they have it wrong. Adobe has it correct. There is no mention of dpi in Photoshop. Only PPI. And it is only mentioned in regards to printing.
Mentioning color in the answer above confuses your message further. It has nothing to do with either dpi or ppi. And for those printing methods that do not use dots, this is even more an irrelevant thing.
Only PPI is relevant. And you should use it in your videos. This is NOT one of these things where we "agree to disagree". Just because a lot of people us the terms interchangeably does not mean that we should go with the flow. Inches is not the same as centimeters. If you had a student that used these wrong, you would correct them.
So PPI and DPI are far from the same. THAT is a fact, no matter if you believe it or not.
@@OlivioSarikas Nice video but you are quite wrong that a 300 DPI image is also a 300 PPI image. I just printed a 300 PPI image at 1440 DPI. Understanding the difference between DPI and PPI is very important if you print. For screen display it is not relevant.
Raise your hand if you remember the magic of the original Macintosh?
Those pixels were a breakthrough!
Not the original, but the Candy colored Series when Jobs came back to Apple
Oh my god, I will send this video to one of my colleagues.
I nearly got into a shouting match the other week. The reason: he sent me some picture and wanted me to „prepare it for print“ in - you guessed it - 300 dpi. And also „as big as possible, maybe like 2000 px wide“. Told him no. Not possible. Not with a 72dpi image that is some 800 px wide. Told him I cannot „magic into existence“ image data that was never there to begin with - and if I try, it will look like absolute garbage. So you either take this image as-is or leave it. Tried to explain to him that even a huge and expensive 4K TV set will not suddenly magically transform his old VHS tapes to 4K digital images. Still didn’t believe or understand it. We left it at that b/c there were other matters to attend to.
On that note: There better be a special place in hell for people who send in lo res images by way of pasting them into Word documents.
Still im confused 😭
I have a degree in quantum physics and I still can't understand all of this 🤔🤔🤔🤔🤔🤔
The terms PPI and DPI refer to different mediums and should never be used interchangeably. An image pixel is NOT a printed dot. Adobe knows this, as anyone using Photoshop would know. You have managed to confuse the issue even more by using the two terms interchangeably.
I never said they are and also never said that a pixel is a printed dot. maybe you should watch the video again and actually listen
Are you kidding me? You constantly used the term DPI when discussing on-screen images. Watch your tutorial again, and you'll agree with me.
@@myronachtman4304 I case you haven't noticed: Affinity photo only has a DPI setting, there is no PPI setting to talk about. Go to the Affinity Photo Web presets for example. What does it say? Dpi, right? So, what else can i talk about in this software. Even your digital photo camera will save files with a DPI value, not a PPI value. But on top of that: PPI is what your physical screen has. A file does not have PPI. Just like a file does not have DPI. A 3000x3000 pixel image will look on a screen and print on a paper exactly the same if used in the same size no matter what DPI or PPI you set it to. Also, just to make this clear: I really really don't care if you agree with me or not.
@@OlivioSarikas I also don't care if we agree. I do care about stopping the spread of misinformation. Like you say, PPI setting makes no difference to the size of the image on screen because the screen size and resolution determines the PPI. But for printing it's different. The PPI setting is observed and is one way of setting the image size. DPI has nothing to do with image size or PPI. DPI is the output resolution of the printer, usually set lower than maximum to match the paper characteristics and avoid ink wastage.
If you try to upload images for t-shirt design, it will require 300dpi or you can’t upload so i just do what they say 😎
That's because it's a T-Shirt and not a Billboard next to the Highway ;)
And still, you'll notice a massive difference, whether you send them a 100x100 pixel image @300 dpi or 1000x1000 pixel image @300 dpi (just random numbers to show my/Olivio's point). The amount of information/pixels you print at 300 dpi is important, not the dpi setting.
@@Thargoran I just follow instructions 😎
@@Thargoran The t-shirt company has it wrong. First of all it is PPI. DPI is irrelevant. BUT - the important thing for the t-shirt company should be the number of pixels in the image. PPI is just a flag (metadata) and it says nothing about the quality of the image. Also, it does not change an imagefile. A 50 PPI image will be exactly the same size in kB or MB as a 5000 PPI image. Give or take a couple of bytes.
But as many image banks and printshops actually check the PPI of the image, you can not get around setting it to their demands.
@@OlivioSarikas No. It is because the t-shirt company has a check in place when you upload the picture. In this case, you would be able to upload a 100x100 picture as long as it was set to 300 PPI, but not a 2000x3000 picture if it was set to 150 PPI.