Photoshop :: Understanding DPI Vs Resolution
May 7, 2009
I am trying to have an image of mine printed professionally. However the print house I have sent my image to has asked that my image be submited at 300 DPI. My image is already 7200 x 4055 pixles with a resolution of 300. My question is what is the major difference between resolution and DPI and how can I go about correcting the dimensions of my image?
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Nov 10, 2004
UNDERSTANDING RESOLUTION: A beginner's guide
Resolution is responsible for much confusion to beginners in Photoshop. I am providing this guide in hopes to clearing the smoke and answer any questions you may have.
SCREEN RESOLUTION
Before we can get into the 2 most common resolution-related questions, ("How come my images come out smaller when I print them?" and "How come my images come out pixelated when I print them?"), we need to get a grasp of what SCREEN RESOLUTION is.
Your monitor is displaying a certain resolution that you may have commonly heard. Popular ones include "640x480", "1024x768" and "1280x1024". Let's take the latter; this means your monitor is showing 1280 pixels worth of information WIDE by 1024 pixels worth of information HIGH.
IMAGE RESOLUTION
Most web-based images are created with an IMAGE RESOLUTION of 72ppi (Pixels Per Inch). In order to determine the DIMENSION of an image, you merely take it's size and multiply it's resolution. Let's take a 4" x 6" image in Photoshop. To determine it's DIMENSIONS, we do the following:
4" x 72 pixels per inch (ppi) = (4x72) = 288 pixels wide
6" x 72 pixels per inch (ppi) = (6x72) = 432 pixels high
Your 4"x6" @ 72ppi image has a DIMENSION of 288x432 pixels.
UNDERSTANDING CORRELATION BETWEEN OUTPUT AND IMAGE RESOLUTION.
Place that 288x432 px (pixel) image on your monitor screen, which has an OUTPUT RESOLUTION of 1280x1024. The image takes up 288 of the 1280 pixels wide and 432 of the 1024 pixels high. If you change your monitor's OUTPUT RESOLUTION to 640x480, that SAME IMAGE now takes up 288/640 pixels wide and 432 of 480 pixels high. This makes the image LOOK bigger, however it has not changed size or dimensions at all. You've merely changed the amount of information per inch that you are viewing on screen.
ENSURING PROPER VIEWING OF IMAGES
When using Photoshop, make sure your VIEW RATIO is at 1:1 (100% ZOOM FACTOR) A common misbelief is that when you zoom in or out of an image, you are changing it's size/dimension/resolution. This is not true. Understand that you are merely changing how closely you are examining the same image.
WHY DO MY PRINTS COME OUT SMALL?
It's simple math. Your 4"x6" @ 72ppi image is being printed on a printer that outputs at 300 or 600dpi (dots per inch) [side note: Dictate onscreen images as ppi when you refer to their resolution and dictate printed images as dpi when you refer to their resolution]. If we do some math, you'll see why your images come out so small.
4" x 72ppi = 288 pixels wide
6" x 72ppi = 432 pixels high
Print this in a printer that uses 300dpi and we get an image that is:
288 pixels wide / 300 dots per inch* = 0.96" wide
432 pixels wide / 300 dots per inch* = 1.44" high
*Dots/Pixels are interchangable, ie, 1 dpi = 1 ppi.
So that same image you thought would print at 4" x 6", printed at 0.96" x 1.44".
WHY DO MY PRINTS COME OUT PIXELATED/DISTORTED?
For the same reasons it comes out small. The only difference is, that the computer scaled the image to the dimension of the original. (Tried to scale your 0.96" x 1.44" image to the dimension of 4" x 6") This is like trying to get a gallon of water out of a shot glass. The end result of this scaling is a pixelated/distorted image.
SO HOW DO WE FIX IT?
Merely known what the end dimension you want the image to be, and the OUTPUT RESOLUTION of the printer you're using.
1. I know I want an image to be 8.5" x 11"
2. I know my printer prints at 600dpi.
Do the math:
I need a document that is:
8.5 x 600 = 5100 pixels
11 x 600 = 6600 pixels
5100x6600 pixels in Photoshop.
This image will print at your desired dimension on that printer without distortion/pixelation or being shrunk.
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Aug 9, 2013
With the Adobe CC upon us, I'm am questioning staying with Adobe proprietary DNG (proprietary in the fact it has edits embedded that only Adobe products understand) and PSD files long term.
I have never used Lightroom. But am a heavy Photoshop/ACR user. I have many ACR edited DNG files and multi-layered Photoshop files.I want access to my files in the future (including edits) without having to always have the monthly CC subscription (in the future).
Question: Can Lightroom (not a CC product currrently and hopefully not in the future) open & understand the edits (cropping, color balance, lens correction, ...) I've already done to my many DNG files in Adobe Camera Raw?
Even if I use the CC in the near future and eventually not subscribe, I want future access to my DNG and PSD format files, including all the edits).if Adobe guaranteed a free PSD & DNG viewer (understand the layers, edits, ...) and give the ability (for all time) to export to a flattened image with edits applied to TIFF!
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Jun 5, 2011
I have happily migrated to Xara Designer Pro 7 for our company web design. But I am coming from a program that handled background images and object properties differently,URL...
In Net objects, to do this, you set a background colour in the sitestyle menu, set the background tile using the body tag in the text styles or CSS menus, and place the decorative paragraph graphics as backgrounds in individual text boxes or layout regions.
I think layered designs like this would probably be achieved by a combination of features and tweaks, but cannot work out how. I can get a background colour on the pasteboard as well as a design - using a Tweak. But doing it this way means that the design does not align properly - at least not so far as I have been able to achieve.
Would love to know the views of the experts here, particular those who also use Net objects Fusion.
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Feb 20, 2012
how the check in/check out process works, and how that's related to the information in the project files (if it is)? I'm thiking of basic questions, such as how does Inventor know when a file is checked out, and where is that information recorded.
For reference, I'm using Inventor 2010 in a non-vault environment, with single-user projects, on a small corporate network. I've been using 3D CAD since late in the last millenium, but I've only been using Inventor for one year. My previous CAD experience was with Solid Designer, Solid Edge, and SolidWorks.
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Apr 20, 2013
If I use 250ppi and 2000x2500 but then change that to be able to print a larger image (300ppi 3000x4200 - 10x14x print, for example), what exactly happens to the image when I increases pixels and ppi? Does it improve/degrade the quality?
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Mar 17, 2013
I realize the nature of my question maybe asking the impossible, but I have a low res image I downloaded from the internet, placed in an InDesign page, blew it up and printed it out. I was going for the distressed look that it has, it looks ok when I print it out considering it's low res and I blew it up fairly large. However, it's a little too pixelated to look professional when printed. Are they any tricks or things I can do to make it look higher res for print. I've attached the image as well as a screenshot of the InDesign file so you can see it in context.
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Aug 25, 2007
I am a Photoshop newbie and I have a series of graphics (all 72dpi from a website) that I would like to print in 300dpi. Is it possible to take a 72dpi .jpeg or .gif file and easily convert it to a higher resolution printable graphic? If Photoshop can't do it, is there any type of program that can?
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Oct 23, 2004
i have some big .jpgs with low resolution say 10x10 inch at 72dpi.
is it possible for me to convert it to 2x2 inch at 300dpi?
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Jul 8, 2004
I am having some problems getting the hang of applying the drawing scale to my assignment. I understand the scale factor that is applicable to the printing only and that AutoCAD doesn't care about the units used...but something is not clicking here and I'm sure it is pretty simple. My assignment requires me to draw 3 simple structures at 1/8" scale on 11X17 paper. Each house is 20' long with 10' walls and each is done in absolute, relative, and polar. I actually completed the work with all 3 formats without specifying the scale or paper size, just to get familiar with the commands. But now that I am trying to set the dimensions correctly, I cannot replicate my work because I'm getting lost in the way things are defined. I am using AutoCAD 2005, also have a 2002 version to which I can defer.
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Nov 17, 2012
I'm trying to create a high resolution version of a low resolution texture used in a game. I've found a pattern that I think is acceptable, from a real image.Now the question is this: how can I colorize the large image to that it is as resemblant as possible to the original one? I've tryed a simple colorize, but the result is not so good...
Original texture:
[URL]
The image to be colorized:
[URL]
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May 7, 2009
I am trying to have an image of mine printed professionally. However the print house I have sent my image to has asked that my image be submited at 300 DPI. My image is already 7200 x 4055 pixles with a resolution of 300. My question is what is the major difference between resolution and DPI and how can I go about correcting the dimensions of my image?
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Jun 8, 2008
I am going to edit the photos from Photoshop CS3 Extended at the highest possible Resolution so the photos look amazing when printed from a normal printer or at a proper photo lab. What is the highest possible resolution I could use on the photos without making them look all pixelated (or what ever it looks like) when printed? I was told by a friend that 300 pixels/inch would yield better but is it possible I could go higher?
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Dec 5, 2005
my resolution doenst seem to be changing...I'm opening up image size, unchecking resample to link the size and resolution, upping the resolution and clicking ok. I would assume that the picture is supposed to get smaller, but nothing changes.
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Nov 3, 2007
Since resolution is such an important factor to whether a pic is sharp and clear, how is photoshop able to increase the resolution of the pic? From what I heard, the picture is broken down into more pixels when the resolution is increased. If so, how can it distort the pic?
I also have this senario which I'm facing now... Since it's rather confusing, I have broken it down into Steps...
Steps
1) Open picture A in photoshop
2) Transformed picture A smaller so that it is easier to work with (less lag)
3) I created some layers and merged all the layers together
4) Copy the merged layer into another Art piece in Photoshop
5) In the new Art piece, I transformed the merged layer back to the original size
As I transformed the merged layer back to the original size, will it become distorted? Or will the resolution remain around the same?
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Mar 22, 2006
I created a 4x8 photo, added images and text, saved it. When I print it, the resolution goes below 150dpi. Why is that? What can I do to get it to print exactly how I created it to be?
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Jul 13, 2004
I have several images that are in Powerpoint and jpgs and gifs. I need to get it ready for print and I need to make it to 300dpi? I downloaded a free tryout of Adobe Photoshop, but am not at a loss. I know how to transfer the images into jpg or gifs. The images are approx. 625x425 pixels.
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Aug 13, 2004
I designed it for 1024 x 768 and when I tested it on 800 x 600, it has poor quality. I tried to increase the resolution in the .psd file but that doesn't seem to help, which surprises me.
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Jan 22, 2007
I'm preparing some images for stock
they are all now 50mb tiff files about, 5000x 3000 pixels more or less.
In the resolution box, the ones scanned by nikon film scanner are 4000.
the ones shot digitally converted by Camera Raw are 240.
And then I have a few from some Large jpegs that are 72.
Does any of this matter? ie, what it says in the resolution box?
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Oct 18, 2012
Does changing the dpi of an image change the resolution of the image without changing the size?I have an image that is 300 dpi that I need to enlarge 400% changing the dpi to 75.I don't think manually changing the dpi to 600 will actually change the clarity of the image when enlarged 400%.
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Jul 6, 2013
Recently, Photoshop CS3 (installed on PC with Windows XP) has been changing the resolution of my images. I'll create an image and save it (as anything... jpg or png). When I close and reopen the image, its values have changes. For example: a 10 x 5" images at a resoltion of 300 will somehow change to 100 x 50 at a low resolution of something like 6. I'd like to know what causes this.
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Jun 24, 2013
When I would change a resolution in PS6, say from 300 to 72, the image size would automatically resize accordingly. In PS CC it does not. I want to be able to have PS CC work like PS 6 in that regard, but can't figure it out. I see there are predetermined sizes but nothing like in PS6
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Sep 1, 2012
I am using a Netbook as of now. The resolution of it is 1024x600. Why are you not aloud to "save" or "save-as" with a resolution lower than 1024x768? The weird part is, when I close a tab on Photoshop, it will ask me if I want to save and it will let me save my work as a Photoshop Document. It also makes no sense on how Fireworks will let me use "save" and save-as" with my resolution. So is there anyway I can save my work on Photoshop other than using .psd format?
Additionally, I transfer the .psd to Fireworks and then save my work from there. Only problem is that none of my effects (i.e. Bevel & Emboss) on layers show up when they are transferred to Fireworks.
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Jun 24, 2013
i use led wide screen monitor but it's show wide and when i want to use photoshop i must change monitor resolution to 1920 * 1080 this is good & show everythin normal but this is very small if it's possible which resolution can i use that show normal & good for photoshop & other editing software
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Aug 6, 2008
If I go to create a new template in Photoshop Elements 6, what sizes gives the best resolution or print quality.
Basically I am looking at creating photocards for 4x6 and 5x5 and would like it to look good when printing out. Therefore the higher resolution the better.
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Nov 3, 2007
I've been wondering... Since resolution is such an important factor to whether a pic is sharp and clear, how is photoshop able to increase the resolution of the pic? From what I heard, the picture is broken down into more pixels when the resolution is increased. If so, how can it distort the pic?
I also have this senario which I'm facing now... Since it's rather confusing, I have broken it down into Steps...
Steps:
1) Open picture A in photoshop
2) Transformed picture A smaller so that it is easier to work with (less lag)
3) I created some layers and merged all the layers together
4) Copy the merged layer into another Art piece in Photoshop
5) In the new Art piece, I transformed the merged layer back to the original size
As I transformed the merged layer back to the original size, will it become distorted? Or will the resolution remain around the same?
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Jun 30, 2008
For some reason whenever i open up an image it seems to default that image to 240 resolution. I can't figure out why! Even if i output an image with 72 res, and reopen it, it'll go back to 240! Any ideas on what the heck could be going on guys?
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Feb 22, 2005
try to record those steps for action: Image>Image Size --> then change the resolution (a lower res p.e. 50dpi from a 300dpi pic) but want to keep checked the other setings (Constrain porportions and resample image) and click OK --> and stop recording the action keeps the height you have as result from your first (recording) pic !!! and make the next time you use the action all the pics the same height.
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Nov 26, 2007
I created a graphic to use on the web (72 dpi), client called and now they want to print it postcard size so they can mail it out. The Original image is 480 x 611.
Most of it is just text and a few rectangle marquee boxes to give color. There are three pictures used. What's the quickest way to replicate this? can I just create a new document at 300dpi and drag all my layers(except the pictures) into it from the low res one or do I have to recreate everything?
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Jan 23, 2006
can i have them in 1M size, 300dpi.
Now, does 1M size mean 1 megabyte file size or is it the pixel dimensions figure in the image size dialogue box?
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May 8, 2009
how do i enhance the resolution for better print quality. its a small picture that i want to print out poster size.
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