Ppi / dpi

Hello!
Please, somebody help me, if possible, with an algorithm (or a pointer to such an algorithm) that allows saving an image in a (png, for example) file, with a pre-set resolution (pixels per inch), to have the possibility to visualize (process) a set of patterns (shapes) having the same dimensions in inches (millimeters), which can be represented using different numbers of pixels - like scanning the same image at different dpi resolutions.
Best regards,
Sandu Crasteti

Similar Messages

How to view resolution (ppi/dpi) and bit depth of an image

Hello,
how can I check the native resolution (ppi/dpi) and bit depth of my image files (jpeg, dng and pef)?
If it is not possible in lighroom, is there a free app for Mac that makes this possible?
Thank you in advance!

I have used several different cameras, which probably have different native bit depths. I assume that Lr converts all RAW files to 16 bits, but the original/native bit depth still affects the quality, right? Therefore, it would be nice to be able to check the native bit depth of an image and e.g. compare it to an image with a different native bit depth.....
I know a little bit of detective work would solve the issue, but it
would be more convenient to be able to view native bit depth in
Lightroom, especially when dealing with multiple cameras, some of which
might have the option to use different bit depths, which would make the
matter significantly harder.
This
issue is certainly not critical and doesn't fit into my actual
workflow. As I stated in a previous post, I am simply curious and wan't
to learn, and I believe that being able to compare images with different
bit depths conveniently would be beneficial to my learning process.
Anyway,
I was simply checking if somebody happened to know a way to view bit
depth in Lr4, but I take it that it is not possible, and I can certainly
live with that.
Check the specifications of your camera to know at what bit depth it writes Raw files. If you have a camera in which the Raw bit depth can be changed the setting will probably be recorded in a section of the metadata called the Maker Notes (I don't believe the EXIF standard includes a field for this information). At any rate, LR displays only a small percentage of the EXIF data (only the most relevant fields) and none of the Maker Notes. To see a fuller elucidation of the metadata you will need a comprehensive EXIF reader like ExifTool.
However, the choices nowadays are usually 12 bit or 14 bit. I can assure you that you cannot visually see any difference between them, because both depths provide a multiplicity of possible tonal levels that is far beyond the limits of human vision - 4,096 levels for 12 bit and 16,384 for 14 bit. Even an 8 bit image with its (seemingly) paltry 256 possible levels is beyond the roughly 200 levels the eye can perceive. And as has been said, LR's internal calculations are done to 16 bit precision no matter what the input depth (although your monitor is probably not displaying the previews at more than 8 bit depth) and at export the RGB image can be written to a tiff or psd in 16 bit notation. The greater depth of 14 bit Raws can possibly (although not necessarily) act as a vehicle for greater DR which might be discerned as less noise in the darkest shadows, but this is not guaranteed and applies to only a few cameras.

Help with correcting screen PPI/DPI???

I just got a new 20 inch iMac. The screen resolution is at full, so the ppi (DPI?) is like 98 or 96 or something, but it seems like the computer thinks it is at 72! This is bad, because in Word, the page is too small when I set it to 100% (I have to set it to 136 percent to get it right), G-Ruler is not showing the right inches size, and there are similar problems with other programs. How do I tell the computer what the PPI should be? Is there something I can download to fix this, or is there some admin setting I haven't noticed?

newhere123321:
May I suggest that you post in Your Intel-based iMac Display forum where there will be others who will be familiar with your hardware.
Good luck.
cornelius

PPI/DPI setting... why do you want it?

I occasionally see requests for a PPI/DPI setting in Aperture and I just noticed a request for the same in the discussion about Adobe's Lightroom. I've posted comments about why a PPI/DPI setting is not needed, so I'm curious to see if maybe I'm missing something and I'd like to hear some feedback on the subject to help educate myself and others along the way. If my examples aren't exactly clear and seem confusing, perhaps someone else can explain what I'm saying in a much more elegant and easier understood way.
Here's a copy of my original post about the subject. I've added a few other examples for further clarification on pixel dimensions in relationship to output.
"An output ppi/dpi setting is not necessary and not relevant and here's why...
Remember, were talking about pixels here, not inches. Pixel dimensions are all that matter when it comes to sizes in digital photography.
So when you export an file from Aperture and want something different from the built-in presets, choose "Edit" from the "Export Preset" pop-up in the Export dialog box. You can then add your own settings based upon the output pixel dimensions you would like to have.
For instance, if you need an 8 x 10 inch image, then take whatever ppi/dpi you would like and times it by those dimensions. A common standard for the web is 72ppi, so your pixel dimensions for an 8 x 10 inch image will be 576 pixels x 720 pixels. A common standard for printing is 300dpi, so then an 8 x 10 inch image will need to be 2400 pixels x 3000 pixels.
Hence, say you have a 2400 pixel x 3000 pixel file, it would equal...
- 8 x 10 inches @ 300 ppi
- 33.333 x 41.667 inches @ 72ppi
- 4 x 5 inches @ 600ppi
- 10 x 12.5 inches @ 240ppi
- 2400 x 3000 inches @ 1ppi
All the above listed dimensions will give you the exact same perfect 8 x 10 inch print from a 300dpi printer. In fact, whatever the dpi of the printer, each of the above listed dimensions will print the same size on the same printer.
Say you gave your favorite printer a file that another image editing application (Photoshop perhaps) says is 33.333 x 41.667 inches @ 72dpi or any of the other combinations I listed above. Well most printers are set to print at 300dpi, so it would output perfectly as an 8 x 10 inch print. If the printer was set to print at 360dpi, then you would have a perfect 6.667 x 8.333 inch print.
Again, if you need an 8 x 10 inch print and the printer prints at 300dpi, then you need a 2400 x 3000 pixel file, if you need a 16 x 20 inch print, and the printer prints at 300dpi, then you need a 4800 x 6000 pixel file. If the printer prints a 240dpi, then an 8 x 10 inch print would need to be 1920 pixels x 2400 pixels and a 16 x 20 inch print would need to be 3840 pixels x 4800 pixels.
So, you see, it doesn't matter what you ppi/dpi is, it can be anything you want it to be. The only thing you need to know is what you want your pixel dimensions to be and choose those based upon what your output device is."
-Robert
PowerMac G5 Quad 2.5Ghz Mac OS X (10.4.3) 4.5GB RAM, Nvidia 7800 GT, 600GB RAID

Many of my clients have come to expect me to ftp
their images cropped, sized and sharpened for final
reproduction. They say they get much better results
when I handle all of that. I'm billing by the hour
for Photoshop type work, so it has become a profit
center, and I find that when left to the printer to
sharpen files, and oft times even the designer, they
do not do such a great job.
So, the ability to export at a given size and ppi is
a feature that does not seem at all unreasonable.
Telling my clients that their requests for files at
300ppi are unreasonable is unreasonable. It is not
befitting of a "professional" program to ask us
constantly to do workarounds for such commonly
expected capabilities. But it is, like so many
other "we know best" features, the Aperture way.
David,
I completely understand your point and I really do believe that it would be very simple to add a function like this to both Aperture and Lightroom. It's not like such a common setting is a complete mystery to software developers or anyone associated with the commercial arts industry. So, in light of the fact that Adobe, the king of the commercial art software industry leaves a simple common function such as this out of their application also, one has to ask, why?
I really don't believe for one second that Apple just dropped the ball and didn't include this function just because some believe they rushed a product to market. That just doesn't make any sense. How could you not include what is considered to be such an important function by so many out of an application. Nope, I don't buy it, I truly believe it's not include it on purpose.
So again, I ask why?
I keep having to rethink about what is just "photographic". Remove myself from the business of running my studio. Forget about what a photographer needs in order to run their business, I myself use Photoshop, Bridge, InDesign, Illustrator, GoLive, Quark, QuickBooks, many times a week if not everyday. I need all these things and much more in order to conduct business, but business isn't "photographic". Business is business.
Photoshop is an absolutely wonderful application, but it doesn't do "photography" very well. This is where both Aperture and Lightroom come in. They both ask, what is "photographic" and then only do that.
And again, I keep coming back to the fact that the ability to control DPI/PPI settings is a pre-press function only, it's not a photographic function, never has been and never will be. It maybe a common function that a photography studio may need, but it has absolutely nothing to do with photography. It's strictly pre-press.
With both these new products that Apple and Adobe have offered the photographer, I think they're really trying to drive home the point that they want us "Photographers" to really re-think how we've done things in the digital realm all these past years. They want to help us be "Photographers" not just businesspersons that need to run a multi-function commercial art business.
-Robert

What PPI/DPI should I use when making a DVD menu in PS?

I am making a movie in HD and am wondering either the PPI or DPI recommended. Thanks!

a13firman wrote:
Sorry to resurrect this but when I burn the menus to a DVD they look sort of fuzzy. Now if the PPI doesn't matter what can I do to increase definition? I used the DVD Presets that PS provides
You are either authoring/ transcoding wrongly or, assuming you refer to subpictures (buttons) looking rough around the edges, see normal behavior for a DVD. This has nothing to do with how the graphics are prepared in PS. In case one it's am ater of chosing the right settings, in case two it's a design limitation of the DVD(Video) specification. If you can tell us, what exactly you do and what program you use, we may be able to provide some tips.
Mylenium

Any way to change PPI when choosing save for web? Seems to force 72 ppi/dpi

I'm doing business cards for clients and submitting them to the printer in PDF which works out just fine. However when I submit a jpg as a proof (to show orientation) they complain that I should do a higher resolution for the proof. Illustrator seems to force 72 dpi/ppi (I realize these aren't exactly the same thing) when I use save for web. If I use "export" instead Illustrator doesn't seem to honor my crop dimensions and I get an export that bares no resemblence shape-wise to the original document. Why can't I just put 300 ppi in somewhere and get a higher res output? Thanks for your help!
Patrick

It was because the business cards had a particular curved die-cut and they wanted to know exactly where I wanted the cut. I sent them a 250pixel wide one and they bitched about it but did it. Yes I sent them a PDF for the printing and it turned out just fine... I just wanted a quick raster export with curved die-cut lines and couldn't do anything other than 72dpi apparently.
edit: Was also trying to send a client a quick jpg or png proof today and couldn't do anything bigger than 72 dpi (in save for web)... when I tried to export a png instead the cropping was way off. I remember crop-area-make in older versions of Illustrator but apparently they took that option out while still requiring it

How do I increase the resolution (DPI / PPI) of a scanned image on my iMac?

How do I increase the resolution of a scanned image. i currently am using a new All in one HP Photosmart 5512, I've installed all the proper drivers have a usp cable connecting the AIO to my iMac. I am running OS 10.7.4.
The HP Utility icon only allows me increase the file size (image quality) not the PPI/DPI
Thank you in advance for any help
This question was solved.
View Solution.

Hi,
You may change the Resolution using the HP Scan application as following:
Click HP Scan at the top and then click Preferences.
Within the launched windows select the required Resolution.
close the Preferences window and perform the scan.
Regards,
Shlomi
Say thanks by clicking the Kudos thumb up in the post.
If my post resolve your problem please mark it as an Accepted Solution

Placing Images and PPI issues

Hello, I am new to InDesign.. I am a digital artist who has only used PS in the past, so I'm used to manipulating images however I like concerning PPI, DPI, and pixels. I am now creating an app for ipad use and created the background images for the pages in PS. Now, I'm placing them into ID. When I do that, no matter what I have the file saved as, it converts the image to a different ppi.
When I created the images in PS, I used the standard ipad resolution (262px) and dimensions. When I created the ID file, I used the standard ipad dimensions and the ppi is obviously much lower, at 72?
Is there a way to set the ID resolution, or do I need to create my documents with only 72ppi? This doesn't seem like it would give the best image viewing available on the ipad.
Thank you!

InDesign respects the original size and resolution of images, as long as you keep them at 100% of the original size. When they are at 100%, the "Actual ppi" and "Effective ppi" fields of the Info panel display the same value. In your specific case, the Info panel needs to show "262" in both fields. If not, it means that the respective image is scaled. To verify its scale, click the image using the Direct Selection Tool (the "white arrow" one) and look at the percentage fields in the Control Panel. (By the way, the resolution of the retina iPads is 264 ppi, not 262.)
When importing an image, the easiest way to assure that it will be placed at 100% is simply clicking the loaded cursor instead of dragging it. Give it a try.
But bear in mind that this "ppi" issue only matters for print publications. For tablet apps, what is important is the number of pixels; the resolution is irrelevant. For retina iPads, you need to use twice the size you use in a standard screen iPad. So, if you want a full-page image in an old iPad, the image dimensions must be 1024 by 768 pixels. If you want the same image in full screen on a retina iPad, create it with 2048 by 1536 pixels. You'll get a better explanation here: http://www.planetquark.com/2012/03/14/132-ppi-72-dpi-264-ppi-what-image-resolution-should- you-use-the-for-new-ipad/#.UhdbsLwWFL8

How can i change the DPI of an image to 400 in illustrator?

I'm very stuck with trying to change the DPI of an image to 400 so that it is ready to print and the resolution will be fine once printed but i have no idea how to do this in illustrator?

dpi,
If you are talking about a raster image placed in Illy, you can only change the size to get the desired PPI/DPI.
If you are talking about raster effects or a raster image created in Illy, you may set the desired resolution of raster effects, or the desired resolution or total pixel x pixel size of the exported/saved image.
If you are talking about pure vector artwork, the resolution depends on your printer (driver) (settings), as Doug said.

Printers require 300 dpi - A different question/issue about 72 dpi

Hello,
I've read through many of the threads on 300 ppi/dpi. I understand the solutions offered such as batch processing and how the printer will print the image size that equals the 300 dpi. However, I have a different issue. I purchased just this week a Rebel T5 with the assumption that I would be able to take 300 dpi images not 72. I create books for print and my printers require 300 dpi. They will not do the conversion. My options in the past have been film camera to CD (old, I know) or the iPhone. I was spending a lot of time in Photoshop getting the images to printer requirements. So imagine my dismay uploading the first batch of photos into Photoshop and seeing 72 dpi. Yes I was able to change them 300 - but this is exactly the production work I had hoped to not have by purchasing the new Rebel.
There has got to be a better way?
Or is it a different digital camera I need to purchase?
Thank you for your help.

writerinpjs wrote:
Hello,
I've read through many of the threads on 300 ppi/dpi. I understand the solutions offered such as batch processing and how the printer will print the image size that equals the 300 dpi. However, I have a different issue. I purchased just this week a Rebel T5 with the assumption that I would be able to take 300 dpi images not 72. I create books for print and my printers require 300 dpi. They will not do the conversion. My options in the past have been film camera to CD (old, I know) or the iPhone. I was spending a lot of time in Photoshop getting the images to printer requirements. So imagine my dismay uploading the first batch of photos into Photoshop and seeing 72 dpi. Yes I was able to change them 300 - but this is exactly the production work I had hoped to not have by purchasing the new Rebel.
There has got to be a better way?
Or is it a different digital camera I need to purchase?
It's that you (abetted by Photoshop) are reading too much into the term "dpi". The size of a digital photograph is measured in pixels, not inches. For a given pixel count, the picture will print smaller at 300 dpi than at 72 dpi, but will have, by definition, a correspondingly higher resolution. You start with a RAW image and crop it to the desired aspect ratio. Then you compute how many pixels you need in, say, the longer dimension, given the native resolution (e.g., 300 dpi) of the printer and the desired picture size (e.g., a length of 10 inches). Finally, you convert the image to JPEG, setting the number of pixels in the long dimension of the converted image to that computed number (e.g., 3000). Then when you print the image, things will come out right. What you describe above is Photoshop trying to do the calculation for you. But IMO, that usually just adds confusion. Work in pixels and you won't go wrong.
The calculation is different, though just as straightforward, if the printer differentiates "dots" from pixels. But I think most modern printers either don't make that distinction or do it behind the scenes, so that you can specify everything in pixels.
Bob
Boston, Massachusetts USA

DPI Scaling on Multi-Monitor (Windows 8, 8.1)

Hi, I have two monitors, one internal and one external, configuration goes as follows:
MacBook Pro (Retina, 15-inch, Mid 2012) Native display/monitor
2880x1800px
15.4"
221 PPI/DPI
Detected by Windows as: "Generic PnP Monitor"
LG D2343P External Monitor
1920x1080px
23"
96 PPI/DPI
Detected by Windows as: "LG 2343(Digital)"
I want to make both displays to work together with different "DPI Scaling" on Windows 8.1 Pro Preview so GUI elements render correctly scaled between them just at it happens on Apple OS X, I have read an excellent article which shows how to change and customize this settings but settings apply over all displays and there isn't a way to make windows know the DPI/PPI of the Retina monitor.
http://www.eightforums.com/tutorials/28310-dpi-scaling-size-change-displays-wind ows-8-1-a.html
How can I achive this?

Hello. I have the same setup - Windows 8.1 on Macbook Pro Retina and Thunderbolt display.
What I've noticed is that in the device manager both the Thunderbolt display and the Macbook screen show up as "Generic PnP Monitor," and I am wondering if these generic device drivers are not passing the correct resolution/screen size informations to the OS.
Maybe Apple can create customized drivers for each one of their monitors instead of using the generic driver?

Ken Burns Distortion of Photos

I know this has gone around before but I have not found the answer.
When using the KB effect it really distorts my photos when it is panning in or out. Using imovie and idvd to make the dvd.
Anybody have a fix for this besides not using KB?
Thanks for any help.
Ksmac
2.1 G5 Mac OS X (10.4.8) 2.5ghz RAM upgrade
2.1 G5 Mac OS X (10.4.8) 2.5ghz RAM upgrade
2.1 G5 Mac OS X (10.4.8) 2.5ghz RAM upgrade
2.1 G5 Mac OS X (10.4.8) 2.5ghz RAM upgrade
2.1 G5 Mac OS X (10.4.8) 2.5ghz RAM upgrade

ppi stands for pixels per inch.
Really??? Gosh, imagine that
I can usually tell when someone comes onto the forum with a graphic arts design background - they always want to talk in inches and ppi or dpi...... (Is that your background by any chance?)
Those of us who have been working with digital cameras for years know that what really counts is the actual pixel size.
I have not been unable to see any difference when the ppi ratio is changed as long as it is high enough to fill the photo area in iMovie (unless you are in HD mode).
That's because, as I said, the iApps only care about the pixel count - a 720x540 pixel image is just that. The document I referenced earlier give the suggested pixel sizes.
If you are scanning images on a scanner, you willl need to set the scanning ppi high enough based on the image physical size to give you the necessary pixels. If you are using digital images from a digital camera, forget about ppi/dpi in iMovie and iDVD.
But, back to the issue of the handling of photos in iDVD.
Have you experienced the problem of the jump to fuzzy when not using the kens burn on stills? I find it also in the slideshows made directly in iDVD
People report a variety of such issues - some see problems like that associated with using some of the transitions in IDVD.
Most people recommend that after creating a movie in iMovie, when sharing to iDVD and are asked if you want to render the project in iMovie before going to iDVD (or words something like that) you say NO.

Saving images to PNG

Hi,
I'm trying to save my images to PNG so that I can upload them on the web. I need the images to be a specific size - which I stipulate via the artboard size.
However when I try to save my images (via File, Save for Web and Devices) the image never saves to the size/outline of the artboard.
Does anyone know why this happens and how I can get my images to save to the pixel size that I need?
I'm using Windows 7 and have Illustrator CS5
Thanks

When you create your original document do you set the profile to Web and check that the ppi/dpi settings are the same as the output you need for your webpage?

File Resolution Export Problem

I'm having problems with the resolution option when I export my images as jpegs in Lightroom.
In the export dialog box, I enter the file resolution as 240ppi, but once the file is exported and I open it in Photoshop or Bridge, the resolution is 72ppi not 240ppi. Any ideas what could be causing this?

Screen display ignores the PPI setting. Set PPI in LR to 1 on a test image. That image will display exactly the same as the same image set to 300ppi. PPI/DPI are printing issues, not screen display issues. Screen display is controlled by pixel dimensions only. Try it you will see.

Pixelated images (with High Quality Display turned on)

Here's my problem: The images look sharp on the internet, but when I download them, place them in Indesign and print them, the look pixelated!
Take this one for example: http://media.smashingmagazine.com/images/typefaces/productus.gif
It's resolution is 72 ppi. But when I place it onto the Indesign A4 page (or Letter format for that matter) it occupys almost entire width of the page.
Why is it so? Why is it so big by default without enlarging it? It's kinda logic that a small 72 ppi image stretched across the whole page will appear blurry when printed on 300 dpi printer.
So how can I set the indesign page to 300 ppi/dpi so images with lower restion will appear smaller when placed on the page and - will be printed sharp?

mike.n03 wrote:
Where can you specify this preference?
And you mean there's a script for InDesign? Wow, it would be cool to get it. So far I solved that problem by recording an Action in Photoshop and than apply it to all the images using Batch command.
Preference is down at the bottom of the File Handling section ... Check the bos to preserve dimensions and a the relinked file will be scaled back to the same size in ID. Uncheck, and the scale percentage will be preserved.
Almost anything is scriptable in ID (but I don't write them). I recall a script that was posted a year or two ago that would allow you to select an image and type a desired effective resolution into a dialog. The image would get scaled to reach that effective ppi. Your batch action in Photoshop is fine, and useful if you want to palce everything at 100%, but it isn't required to change the resolution in Photshop to achieve what you want. Scaling in ID is exactly the same thing as changing the resolution without resampling in Photoshop. No pixels are added, removed or altered -- only their dispalyed size is changed. If you want a script to set all images to 300 ppi effective resolution, you should probably pay a visit to the scripting forum.

Ppi / dpi

Similar Messages

Maybe you are looking for