Understanding Image Resolution - PPI and DPI: Ask David Bergman
ฝัง
- เผยแพร่เมื่อ 19 พ.ค. 2024
- David Bergman answers multiple questions from viewers' image resolution, how to size files for client delivery, how many PPI or DPI do you need to print an image, and how many pixels per inch will give you the best quality.
Go to www.AskDavidBergman.com to submit your own photo question, see David's gear list, and view the episode archive.
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Thank you, David! Very helpful!
Thank you so much David for the awesome explanation of the matter! Very useful and informative!
Thanks for the explanation!
Thanks so much for the video! Very much appreciated.
Thanks David for your insight. That's a big help!!
Glad it was helpful!
Wow! Another beautiful job of explaining a complicated subject in an understandable way. Thank you, David. That is very helpful.
Trying my best, thanks!
That explained a lot for me. Thanks.
Finally someone who says that 20 megapixels should be enough. Everyone called me crazy when I bought a 20.9 mp camera
I'm still learning so please don't take this as me being rude. Do you have to photo edit a lot?
24 Mpix for A2 is information I got from a professional landscape photographer. I calculated around 34 Mpix and now I got a 36 Mpix Nikon D800E camera after that calculation. My other cameras are 12Mpix Nikon D700 and 16Mpix Fuji x-Pro1 and x-T1, all cameras are 2nd hand and I'm waiting for the Nikon Z8 release. I will use the Epson P900 printer for A2 prints
Thank you.
thank bro this helped me alot!
For me alot of the confusion was created by the labelling in the “Image Size” window. “Resolution” is the proper term for total number of pixels that make up the image no matter what size the image is, but then when you adjust your PPi in the little window, that PPi field is also labelled “Resolution”, suggesting that you are modifying the resolution, or total pixels, in your image, which is not the case. When you adjust your PPi you are only changing how spread out or compacted you want those pixels arranged per inch in your computer image.
Great video!
They HAVE to change the label for the PPi field in the “Image Size” adjustment window to something other than “Resolution”. Something like “pixel density” or “Pixels per Inch” , ANYTHING besides “Resolution” which is what it’s labeled as now.
You make very clear that “Resolution” refers strictly to the number of pixels that make up the image.
Adjusting PPi in that field does NOT change Resolution (the total count of pixels in the image). It only changes how spread out or close together those pixels are arranged in space.
This was source of my confusion until I watched this video :-)
What professional printer(s) would you recommend? I like the idea you mentioned about letting them set the resolution based on the size of the photo I need.
So it important to know the range that your printer print at to be sure of best printing image and it color range depending on how many colors the printer can print. It color palette can make difference in the spectrum of color production of the image as to deeper.blacks greys depth of color for the print out of the image. Good coverage of the PPI and DPI thanks
Yes - the more you know, the better. Especially when printing yourself.
Very Useful 😁
Nice video
Tnx 🙂😁♥️
Good! Will share ;)
What advice would you have a for a hobbyist who wants to print? Set up the photo in Ps for the exact ppi you want and dimensions before sending it to be printed?
Is the ppi value set on the Photoshop window actually contained within the file, or is the purpose of setting the ppi value simply to provide information to the viewer as to the size of print that would result if the printer is set to the dpi equivalent of the entered ppi? If ppi is contained within the file, then do I understand that the printer can (and probably will) change the ppi according to their requirement (and assuming file has sufficient resolution for their purposes)? - meaning that it doesn't matter what ppi I set, given that the file resolution is sufficient?
Here’s my question! I will layout a hypothetical more that a real situation. If I have an image with an area of 100 pixels ranging from deepest white to deepest black and I reproduce it on a printer size that is going to reproduce that same area as a single dot of ink does that mean that it will lay down a dot of ink that will be the average of those 100 pixels? Wouldn’t I figure that to be a 50% grey dot of ink?
Hi! I have a picture where the original size is 6240x4160 pixels. I'm hoping to do a 30x20 acrylic print, but I want it to be incredibly sharp and I know that puts it at 208ppi. In Lightroom, there's an export option to choose a ppi. If I export the image at a higher resolution than the original, will I get a higher quality print? Or can the resolution only be as high as the original file?
Thank you for this informative video. Follow up question: Would the largest print you would make off of your 1DX Mark III 20 megapixel camera be 18”x12” with 300ppi? If you wanted to make a larger print than 18”x12”, you would decrease the ppi to 100 (for example) but then have the viewing distance of the print further from the audience than the 18”x12” with 300ppi?
That's exactly right. Although in my experience with modern inkjet printers like the Canon Pro-1000, 150 or 100 PPI still looks great even up close. Try it for yourself and you'll see.
250dpi is safe, a sharp image is almost certainly going to look good at 250dpi. Below that can look good depending upon how close people can get and how sharp the original image was. 100dpi may look good, but you wouldn't want to get too close. So, for a larger image that might be fine, but a 4x6 would likely look like garbage.
@@DavidBergmanPhoto hopefully you see this and can reply - see how you went from 20"x13" at 300dpi and you changed the DPI to 100dpi and it changed to 60"x40" - can you still specify that you want it at 300dpi for higher quality? say set it at 60"x40" at 300dpi?
Very useful information, thanks a lot
Biggest misconception is that you can control the ppi. PPI is determined by your viewing device.
If you have a monitor with pixel density of let's say 100ppi, no matter what you do in software pixel density is physically determined by your viewing device construction.
You are referring only to the pixel density of the display. That's relevant to the image PPI only in the same way that DPI is relevant in printing. Which is to say, not that much -- for exactly the reason you say. However, pixels in the image are not matched 1:1 to pixels in the display or the print. It's up to the display/printer software to remap that pixels and get the best quality from the input it has.
@@DavidBergmanPhoto that's absolutely correct unless your image matches the native display resolution. Otherwise all your careful process, noise reduction and sharpening is blatantly managed by whatever software the end user is using to visualize your picture
Rodrigo Bejarano True, but garbage in, garbage out, right?
@@DavidBergmanPhoto true, but with your image matched to the display native resolution you minimize resizing algorithm damage, you have zero hope for poor color management or display color calibration. 🧐
@@RodrigoBejarano lots of apps use this to their advantage for photo editing purposes. 😂
hi David, what I dont get is the link between different DPI in RAW image format, what is the default DPI of canon crw. format comparing to nikon nef. format, if there is a printing size of A2 by default what the DPI of that image would be otherwise, I cannot reveal it in Lightroom though, if I'm going to export in Lightroom raw format (crw, nef) into jpg or tif for final usage what DPI should one use with it and what rule should one follow?
I have a question
if we need to print a 10feets * 20feets (200 square feets ) Banner how much resolution we need set...? Please clarify, i need to know bcoz iam confusing lot's of time while exporting the file to print..!
Does a PI need clear pictures or videos of you in the act? Thanks
So you briefly touched on the megapixel count. The consensus with a lot of photographers concerning the new R5 and R6 cameras is why would you get a 20MP camera when you can get a 45MP camera. I’m really torn as to what to get and I’m coming off a 5DIII.
Hi Greg, if you're only into stills a 20mp is more than enough unless you are planning on printing big frames. More pixels mean more noise in low light situations. I have a 1dxMIII and a 5dMIV. If I shoot with the 5D I have much more noise under the same circumstances with high ISO even though I always shoot to the right (meaning the histogram). I'm planning on selling my 5D and buy a R6 as my images are much more cleaner with 20mp. A lot of people only looking for more pixels as they want higher resolutions but in fact the the image will look less pretty as soon as they have to shoot with high ISO. Hope this helps.
20mp from the R6 is plenty big enough for most uses and good way to get into full-frame mirrorless at a lower price point than the big brother R5. 45mp is nice to have if you want to make very large prints (you can go up to 27X18 at 300 PPI and much bigger at lower pixels per inch). More importantly, it allows you to crop the image significantly and still have a very big file. It’s also somewhat “future proof” as I’m sure file sizes and resolutions will continue to get bigger. It wasn’t that long ago when we figured we wouldn’t need any more than 4 megapixels. Lastly, that size is needed to produce 8K video, which is also a big selling point of the camera.
I would agree that for large billboard images measured in 6 feet posters or larger files could be printed as posters at 100 dpi to 150 dpi done at printing houses. However, as I have an Epson P800 for in home printing and for my clients, I prefer to print at 300 ppi or even 360 ppi for photo prints 16x20 inches or smaller. In the magazine and brochure industry 300 dpi is the industry standard. As far as printing on printers inhouse for prints 16x20 in. if someone does not have a high enough Megapixel camera, all you would have to do is interpolate or resize the photo file in Photoshop (or another editing program) to achieve a higher ppi. Any print, at 2 feet or smaller as a wall print could be viewed across the room or at 2 feet away. Older Cameras at 12mp, 16mp, or newer at 20mp or higher can be printed large after resizing in Photoshop (or AI Gigapixel for example).
Yes for professional prepress (like magazines), 300 ppi is the standard.
Upsizing images can help a little, but like I said, it really doesn’t add any more data since it can only work with the pixels it has. I haven’t looked at the latest advancements in that software (because native file sizes are big enough now for most uses!), and I’m sure the algorithms are better than the used to be.
I like to print A2 but my Camera generate 12 Mpix how shall I resize in PS only without AI
I have a photography question. I am not a photographer but I want customers to upload an image. It will be reduced in size to fit on my product.
I don't want to lose resolution. Since the image they upload will be used to print on something. What is the software per say. I can install on my website that will automatically resize and embed pixels in a photo for it to be print ready.
With Raster photos you can always scale down but images will never scale up from what I've been taught. It's a crazy concept to me thinking file size can change all that. Not sure how that effects printing as I mostly work with digital art now. 😂
Okay, I just want to be a bit clear on this as I would like to get some large prints made. If I have a 3757 x 4696 image exported at 300 dpi can I get a large print, say 20 x 30, with good quality resolution?
No, 3757 pixels divided by 300 is 12.5 inches and 4696 pixels gives you 15.6 inches. You need to print at 187 ppi to get 20 inches. PPI describes the printed size of the pixels. Change that number and your Pixels get bigger or smaller
I disagree with Ian. You absolutely have enough pixels to make a 20X30. If you spread out 4696 pixels over 30 inches, that's approx 156 pixels per inch (PPI). It would be nice to have 300 PPI, but as I say in the video, you can get away with anything over 100 - especially since you'll be looking at a 20X30 print from a bit of a distance. 156 will be fine. The only issue you'll have it that your image has an aspect ratio of 4X5 (or 8X10), so you'll either need to crop it or add borders to print on a 20X30 sheet or paper. See my recent video about printing aspect ratios to check out how I'd handle it: th-cam.com/video/cYwjt1ooiu8/w-d-xo.html
@@DavidBergmanPhoto Thanks David!!! I always look forward to your videos. Thanks to Adorama for making these available.
@@Ian_Walsh oooooh!!! This really cleared things up for me. I've learned vector just to get around this issue. I could add as much detail as I want now but it's really taking the long way around. I can proudly say I'm a self taught graphic designer and photographer now. Skies the limit on what comes next. 😂🥰
It depends on your personal standards and your technique. Going down to 200dpi is perfectly reasonable, you can go below that, but expect that a larger and larger share of the prints are going to look bad as you go lower.
If you can arrange for people to be further away, you can drop it further. If you place the print on a wall behind the couch or a table where people can't stand right next to it, you can get closer to 100dpi, or possibly less and still have it look great.
How does this correlate to 4K TV size? I am thinking of buying a cheap 4K TV to act like a "painting" to hang on the wall. With a APSC 26 megapixel camera, what is the size I can get up to for 300ppi?
The short answer is that you can get a TV of any size you want and your 26 MP camera will keep up with it just fine. The long answer is that 3840 divided by 300 is ~13 and 2160 divided by 300 is ~7, so for 300 PPI on a 4K tv you would get a very small TV indeed. Since the resolution doesn't change with the size of the TV then your 26 MP camera has plenty of resolution whether you have a 35" TV or a 75" one. So get whichever one is in your budget and size requirements. Hope that helps!
Response below is correct. 4K resolution is 3840 x 2160 pixels or 4096 x 2160 pixels no matter how big the TV is.
when i upload my images, it always uploads at 72ppi and the pics look great on my computer. but i heard they would not print well and that i should change them to 300. well, i can't do that without resampling (that i know of). and i heard resampling degrades the photo. any suggestions on how to do this?
Upload from your camera? If so, I’m guessing that it’s because you have it set that way in your camera’s quality setting. If possible, select RAW instead, or maybe Large.
Nice haircut!
Just trimmed the bangs and used some product. Can't wait until I can get a proper cut! :)
He’s funny
Anyone else still lost😂
Hah sorry! Where did I lose you? If you want to get deeper into it, check out my one-on-one consultations and we can discuss. www.askdavidbergman.com/1on1/
🤯🤯🤯 350 words per minute is a high TH-cam WPM to follow along with. More confused than before.
You were doing ok until you started interchanging the terms, making it confusing. DPI is for print. PPI is for display. I work in print so know all about print resolutions. Basically, you don't need a file that is higher than 300dpi at the physical size you want it printed at. Otherwise, you end up with a monster file size that takes much longer to process. I would say 300dpi up to A2 and 150dpi beyond that. This is because you are standing further away from the printed image. For very large prints like an 8' x 4', I may even go as low as 100dpi to keep the file size down. I hope that all makes sense. It can be a mind-numbing subject if you're not familiar with it all.
I think that's exactly what I said. Just like you, I'll go as low at 100 PPI with no problem - especially since that's likely for a larger print and it will be viewed from a distance.
@@DavidBergmanPhoto Yes, I think you did say all that. It's just you were saying about 300ppi further into the video and I'm sure you meant 300dpi. Anyway, it's good to have it all explained because I often get questions from clients about what is the best resolution for a particular job. Great video anyway. I'm always watching AdoramaTV and I miss the studio shoots. Hopefully, it won't be too long before we're all back to normal. Stay safe :)
Karl Vaughan Back at ya!
@@KarlVaughan I agree it was going well until the switching swapping of terms, glad i found your comment because it now makes sense to me! When exporting for screen is there a rule of thumb for PPI where you wont see anymore quality on a screen?
This is SO accurate. Spot on. Many forget viewing distance requires much less dpi. I bet the big billboards are even close to just 10-20 dpi but looks okay from far away.
17MAR2023 - Sources of my confusion: (1) TS-2:04 you said, "...resolution is the TOTAL number of pixels in photo . . ." (2) TS-2:18 your pop up window indicates resolution is 300 Pixels/Inch. Image Size is 57.1M. (3) TS-3:00 you said, "5472 by 3648 is the maximum RESOLUTION . . ." (4) TS-3:25 pop up window indicates image size is 57.1M but you said, "... this is a 20 megapixel image size." (5) TS approx 5:30 You're referring to the resolution field as dpi AND resolution, and the Image Size field as resolution. Sorry Boss, you're not helping. I'm out at 5:35.
Very educational, but do you have to talk so fast ????
The explanation is still terribly confusing.
try going into the settings for you tube, the little gear at the top right, you can make a video go faster or slower. I use it sometimes if I am painting along with paint instructor
i dont understand anything because your speed of talk like F16 plane
Please sllow down your speaking and script your videos. This is diffifult to comprehend
Excellent video!