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Resolution determines how many pixels an image contains. These tiny tiles remain virtually invisible unless you zoom in at high magnification. When you measure resolution, you express image size in one of two confusingly similar terms: DPI, or dots per inch, and PPI, or pixels per inch. How you plan to use and evaluate your images determines which of these terms applies and when you use it. Where you measure DPI or PPI value depends on the software or methods you use.
DPI vs. PPI
Dots per inch provides a measure of image size in relation to printed dimensions. You can reinterpret an image to use it at various resolutions, measured in pixels per inch, without changing the overall file size. That's because a 1-inch-square file at 300 PPI contains the same number of pixels as a 3-inch file at 100 PPI. When you print an image, its size relates to the number of tiny dots of toner or ink that your output device can lay down over an inch of paper. An image file only takes on fixed dot-per-inch dimension as a printed object.
File Explorer: Image Info
Microsoft Windows 10 and earlier versions include File Explorer, a multi-pane window that displays information about the location, file type, size and modification date of the documents on your computer. To open it, press Win (⊞) + E on your keyboard. Use the File Explorer to browse your folders until you locate the image file you want. Once you select an image file in left pane of the window, right-click and select Properties. A window appears that shows the file’s information. Click the Details tab to see total size in pixels (width x height) as well as DPI image resolution.
Commercial Image-Editing Software
The full-fledged applications in which you edit, retouch and composite images provide multiple ways to check and change the dimensional interpretation applied to their pixels. Some of these methods simply redistribute image content over a different measurement scale, turning the 300 PPI 1-inch square into a 100 PPI 3-inch file. Other methods actually increase or decrease image size, adding or removing pixels to turn the 300 PPI 1-inch file into a 300 PPI 3-inch file, which alters the clarity of the image. In addition to the functions, menus and dialog boxes that enable you to perform these reinterpretation and resampling operations, these applications also provide readouts and information panels that show you the file's properties. Among the applications in this product category you'll find Adobe Photoshop and Corel PaintShop Pro.
Freeware, Shareware or Low-Cost Utilities
Windows 10 ships with Photos, a viewer and light editor that manages image files and videos, but it focuses on simple adjustments and slide shows rather than on providing information about or altering file resolution. To access file information as well as gain image-editing capabilities, look for inexpensive conversion and scaling options such as GIRDAC Image Editor and Converter or ACDSee. Among the free and low-cost image effects and editing applications for Windows 10 you'll find Aviary Photo Editor, Fhotoroom, Fotor and Picasa.
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About the Author
Elizabeth Mott has been a writer since 1983. Mott has extensive experience writing advertising copy for everything from kitchen appliances and financial services to education and tourism. She holds a Bachelor of Arts and Master of Arts in English from Indiana State University.
Photo Credits
![Change Document Dpi Corel Change Document Dpi Corel](/uploads/1/2/3/3/123379639/527292028.png)
- Richard Newstead/Digital Vision/Getty Images
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Mott, Elizabeth. 'How to Check the DPI of an Image.' Small Business - Chron.com, http://smallbusiness.chron.com/check-dpi-image-77565.html. 22 January 2019.
Mott, Elizabeth. (2019, January 22). How to Check the DPI of an Image. Small Business - Chron.com. Retrieved from http://smallbusiness.chron.com/check-dpi-image-77565.html
Mott, Elizabeth. 'How to Check the DPI of an Image' last modified January 22, 2019. http://smallbusiness.chron.com/check-dpi-image-77565.html
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I have a graphic in both JPEG and BMP format that I need to improve the quality of. I was told that I need to increase the DPI to 400 - 600 DPI, or convert the image to Vector format. I've been reading through the previously answered questions and, if I understand correctly, to convert to Vector format, I can use Adobe Illustrator or Adobe Streamline. I downloaded trial versions of each. The trial version of Streamline does not recognize BMP or JPEG format. I haven't tried Illustrator yet. Just want to make sure that I'm on the right track and I would sincerely appreciate some specific instructions of the best way to accomplish the easiest/best of my options. I'm a programmer and I have a brain, but what I know about graphics would hardly fill a thimble. Thanks! (P.S. This site RULES!!!) I need to change the dpi shown in the Properties of a printscreen jpeg image from 96 dpi to 300 dpi for text editing in Abbyy. How do I do this in Microsoft Paint or other freeware? I need to change the dpi shown in Properties, not just change the image size.
shellshell
2 Answers
Almost any decent program can do this. But depending on which one you are using you need to 'block' the file size.
I understand that Abbyy you are refering to is the OCR program. And somehow is a little 'dumb' needing the file to declare that it is on 300 dpi.
If you are using windows try irfanview www.irfanview.comThen go to Image > Resize/Resample and do not touch anithing but the box where you define the ppi (actually it says DPI)
On any plataform use gimp www.gimp.org
Image > Scale Image and change the X and Y resolution. Simply do not touch the pixel values.
This two cases will simply change the little data embeded in the file.
- Neither of this will modify the image itself. but if you try to print it yes you totally are saying to the printer that the file will be much smaller, but only when printing. That ppi value is just an instruction for the printer.
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I voted it down, because this question is basically just asking for us to tell you how to do something (a tutorial) and that's not what this site is built around. It's also something that can be found easily with a Google search.
![How to export high resolution images from corel draw How to export high resolution images from corel draw](/uploads/1/2/3/3/123379639/766360504.png)
That being said, here's your solution:
Download Adobe CC and take advantage of their free trial
Open the image in Photoshop and go to Image > Image Size
If you wish not to change the image's size, uncheck Resample
Change the resolution to whatever you want.
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Not the answer you're looking for? Browse other questions tagged dpi or ask your own question.
1. Document Size Specifications
To set up a bleed in CorelDRAW:
Click Layout > Page Setup..
In the Bleed: box, type in 0.125
Check 'Show bleed area'
Click OK
To set up a safety zone:
Click Layout > Page Setup..
Click the + to expand Guidelines
Click Presets
Click the User Defined Presets round button
Check 'Margins'
Type in 0.125 into the Top and Left boxes (if mirror margins is checked it will fill in the rest)
Click OK
Click Presets
Click the User Defined Presets round button
Check 'Margins'
Type in 0.125 into the Top and Left boxes (if mirror margins is checked it will fill in the rest)
Click OK
You'll now see the lines as shown (labels added for illustrative purposes)
2. Resolution
To ensure your outputted PDF from is at 300DPI:
Click Layout > Page Setup..
In the Rendering Resolution box, choose 300 dpi
back to top3. Typography
Before proceeding - save a backup copy of your file to make changes to later.
To convert text to outlines
Press Ctrl+A (to select All)
Click Arrange > Convert To Curves
Click Arrange > Convert To Curves
When printing reversed text, such as white on rich black or dark colors, with small type below 8-pt, you should add a thin stroke (between .1pt to .25pt) of white (or light color) to compensate to avoid color overlapping and filling the text:
back to top
4. Color & Black
To ensure your CorelDRAW file is in CMYK:
For each object with a fill:
- Select each object you want to convert.
- Double Click on the color swatch at the bottom right, to bring up the Fill Color Dialog.
- Click the Palette: dropdown box
- Select CMYK palette (if not already selected)
- Click OK (Note: if you were using an RGB color, it may drastically change, the color must be CMYK)
5. Saving Your File
To save as a PDF with a bleed:
Click File > Publish To PDF..
Change Dpi In Windows 10
Choose PDF/X-1a from the PDF preset list.
Click the Settings.. button
Click the Prepress tab
Check the 'Bleed Limit:' box
Type in 0.125 (if it's not already entered)
Click the Settings.. button
Click the Prepress tab
Check the 'Bleed Limit:' box
Type in 0.125 (if it's not already entered)
Click OK
Click Save
Click Save
Open your PDF to verify it looks okay.
In the Units & Rulers Preferences pane in Photoshop CS6 you can set the units used to measure things onscreen (inches, pixels, millimeters, and so forth) and to define a default column size when typing text in multiple columns. In addition, you can define the resolution of the image when you choose File→New and select a preset from the Preset Sizes list.
In the Units area of the pane, you find these options:
- Rulers: Select the measurement units that Photoshop uses for rulers. Your choices are pixels, inches, centimeters, millimeters, points, picas, or percent. The most popular units are inches and millimeters, but if you’re working with publications and specifying in picas, you might prefer that increment instead. If you’re prepping web graphics, you may prefer to have your rulers incremented in pixels.
- Type: Select the measurement used to represent the dimensions of type. Point size is almost universally used, but pixels and millimeters are also available. You may want to use pixels if you’re trying to fit type into a specific-sized area of an image.
How To Change Dpi Of An Image
In the Column Size area, you can specify the following:
- Width: The width of the column in inches, centimeters, millimeters, points, or picas.
- Gutter: The width of the area separating columns, also in inches, centimeters, millimeters, points, or picas.
In the New Document Preset Resolutions area, you can set the following:
- Print Resolution: The default is 300 pixels per inch, a good overall print setting to keep. You can change to another value and use pixels per centimeter as a measurement, if you want. This resolution setting affects the Photo, International Paper, and U.S. Paper presets found in the New dialog box.
- Screen Resolution: Generally, 72 pixels per inch works with most images that are prepped for screen viewing. You can select another resolution and use pixels per centimeter, if you like. This resolution setting affects the web, and Film and Video, presets found in the New dialog box.
Changing the resolution of an image after you created it can impact the sharpness of your image and degrade quality. Choosing the final resolution you want when you create a document is best, whether you specify the resolution manually or use these presets.
In the Point/Pica Size area, you can select whether you want to use a measurement of 72 points per inch (which first became relevant in the Macintosh realm and spread as desktop publishing became widespread) or the traditional 72.27 points per inch definition used in the pre-computer era. Unless you have a special reason to choose otherwise, use the PostScript (72 points per inch) option.