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What is DPI PPI and Why Do They Matter
To some extent, we're all photographers these days. With a camera on every phone and digital SLRs coming down in price, we've all got a trove of photos waiting to be shared. When it comes time to share online, print, or email our favorite images, many are unsure about how to set the image's resolution...
If you've found yourself in this spot, don't worry - dots per inch (shortened to DPI from here on out) is a concept that even confounds some professional graphic artists. Here's a primer DPI so you can stop worrying about technology and start sharing your photos. Getting started
Digital photos are comprised of pixels, much like the individual boxes on a sheet of graph paper. DPI tells you how small those pixels will be when the image is printed. For example, "300 dots per inch" means that 300 pixels fit across each inch. If your photo is 600 pixels tall by 900 pixels wide, for example, it would come out at 2" x 3" inches if you were to print at 300 DPI. Keep in mind that most digital photos are several thousand pixels in either direction, but for the sake of simplicity, we'll use the more manageable 600 x 900 pixels. Separating pixels from presentation
It's important to separate DPI from the raw pixel dimensions, and this is where even the pros slip up. DPI is not an indication of image quality or clarity. When you print that 600 x 900 pixel image at 300DPI, it'll likely look pretty sharp, because every inch is densely packed with pixels.
Now imagine printing that same image, with the same number of pixels, at a mere 30 DPI. As each inch would have only 30 pixels across, the density drops immensely and the image prints much larger: 20" by 30". What was once sharp now appears blurry, because each individual pixel is now ten times larger than before. By separating DPI from actual pixel count, we can understand that raising DPI doesn't magically improve a photo. DPI simply takes the same data (the original pixels) and alters how we'll view them. Pin itIt's all about context
Another factor is viewing distance. Just think of the eye chart at your doctor's office. If you're a bit nearsighted, the tiny letters at the bottom are illegible specks, while the letters at the top are easily discerned. In actuality, each tiny letter may be half an inch tall, but the distance makes them seem microscopic. Now consider our 600 by 900 pixel image. When we printed it at 30 DPI, the giant pixels made it look blurry. Were we to look at it across the doctor's office long hallway, however, it may look just as sharp as the 300 DPI print did in our hands. This illustrates how DPI is more about context than quality.
Pin itPixels Per Inch
You'll notice I've been talking about DPI in relation to printing only. This is because while printers can produce a variety of DPI settings, a computer display's resolution is fixed - its pixel density is part of the physical hardware, and cannot be altered. When talking about displays instead of print, most use the term PPI, or "pixels per inch."
If you intend to put your 600 x 900 pixel image online, switching the resolution to 30, 300, or 3000 PPI is completely arbitrary, because the computer display can't change its density. As modern desktop displays usually have a PPI in the low 100s, the 600 x 900 pixel image will appear around 6" by 9" (mobile displays may be much higher). Of course, your web browser could display the image smaller if need be, but it will do so by averaging and eliminating pixels, not squeezing them to be physically smaller. This is why it's always important to keep your end goal in mind when working with images. In summary:
• An image is defined by its pixel dimensions - # pixels tall by # pixels wide
• DPI/PPI determines the scale and pixel density at which image will be displayed
• What appears blurry from close up may look fine at a distance, so consider how an image will be seen
• Printers can produce a range of DPIs, while displays have fixed resolution
Whether you're a blogger dealing with an upload limit or are just trying to print a photo to hang on the wall, understanding DPI/PPI can go a long way. I hope these tips help you feel more in control of your images and how you share them with the world!
DPI (dots per inch) is an output parameter and has absolutely no meaning to the camera. It has meaning only when you output the photo to a printer or screen.
Let's say you took a photo that's 3000 pixels on the long side. If you then make a 4x6 print, you're putting 3000 pixels into six inches so you're printing at 500 dpi. If you make an 8x10 print, you're putting 3000 pixels into ten inches so you're printing at 300 dpi. Either way, you're printing the exact same picture, only at different dpi settings.
The camera has to put something into the dpi field, so it defaults to 72 which is often used for computer screens. Just about any program you use to print your photos can change this number without affecting anything else.
You can increase the size of text by pressing control + or - buttons press control button first. Also there is zoom in the tools section and also you can increase the size of text in the control panel or the web page under tools sections of most browsers. If we new the browser or what you text is small in or even if it was small every where you can change the resolution size of your Windows. Win 7 you can incease text by going to control panel click on display once there go to where it says increase your text size. Not sure what your operating system is either. So assuming it is Win 7 I hope that this assists you. John
Yes, but only up to a certain size. DPI means dots per inch. A dot is a pixel. Find the number of pixels in the image dimensions on the computer. Divide each number by 300. That will tell you the maximum size you can print the picture for 300 DPI. For example, if the picture is 2500 X 3250 pixels, that would be 8.3 X 10.83 inches.
The printed output is fuzzy, blurry, or grainy, or the edges of objects in the images are jagged.
Follow these steps until the issue is resolved.
Step one: Check your paper
Many papers have printing and non-printing sides. Load the paper with the printing side down.
Use the correct paper type for the project. For everyday documents, plain paper works well. For documents with dense printing, such as high-contrast graphics or photographs, use HP Advanced paper for the best results.
If these steps do not help, try a different paper. Ink might not bleed as easily on heavier paper. Paper that does not accept ink well is also prone to bleeding and smearing. HP designs its inks and papers to work together.
Step two: Check the settings
In the program being used for printing, click File , and then click Print .
The Print window opens.
Make sure the appropriate product is selected, and then click Preferences or Properties .
The Preferences/Properties window opens.
Click the Printing Shortcuts tab.
Consider modifying some or all of the options in the Printing Shortcuts menu to increase print quality.
Print quality : If the quality of the printouts is not acceptable, try increasing the print quality. To print more quickly, try decreasing the print quality.
Paper type : If one of the options matches the paper type exactly, select it instead of Automatic .
Paper size : Make sure that this option matches the paper loaded in the product.
To see additional options, click the Advanced tab, and then click Advanced Features .
The Advanced Features window opens. Consider changing the following option:
Ink volume : Adjust the amount of ink that prints on a page. For lighter images (less ink), drag the slider to the left. For darker images (more ink), drag the slider to the right. The lighter the ink volume, the more quickly the printout dries.
Step three: Check image resolution
Make sure that the image file has enough resolution for the size of the printed picture. Although many photo applications can enlarge an image or part of an image to any size, eventually the individual pixels become visible and the whole image looks blurry.
Here are some general guidelines for image file resolutions:
94 pixels per cm (240 pixels per inch) for images to print on smaller format photo paper, such as 10 x 15 cm (4 x 6 inch)
117 pixels per cm (300 pixels per inch) or higher for larger format photo papers
Lower resolutions might produce acceptable images when printed on rough-textured paper
Step four: Align the cartridges
If the previous steps have not improved the appearance of the printout, align the cartridges. See the user guide for alignment instructions.
PSC 1600 User guide:
http://h10032.www1.hp.com/ctg/Manual/c00276605.pdfClick on this link or copy and paste the complete link into your browser. If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe
the resolutiion dpi has little to do with the camera, its more about printing/displaying - that is just the screen display resolution. you can change that to 300 PPI (DPI) in most imaging applications.
the important thing is the pixels you have length and width
so 1000 pixels x 1000 pixels is the key to this
whats the max pixels of the camera - that would give you the resolution.
now to print an image onto paper the acceoted standard for top quality is 300 PPI
so 1000 pixels width divided by 300 pixels per inch ppi = 3.3 so you can print at 3.3 inches.
Now you may even be able to get away with as low as 180 PPI on some prints and depending on how far away it will be viewed - so this needs to be played with.
- can you reply here - with a comment and tell us
1) how many pixels you have
2) what image editing software you are using
3) how big you would like to print
Do not be too bummed out. The DPI reported in the EXIF data does not mean all that much. What does matter is the total number of horizontal and vertical pixels in an image and how this relates to the output size. For instance, your camera is capable of producing a 2304 by 1728 pixel image. This works out to about 220 DPI when printing an 8 by 10 inch picture. If you look at this the other way around, image editors will indicate an image size of 32 by 24 inches for an image taken by your camera (2304/72 and 1728/72). It is doubtful you will print at this size. Image software will take advantage of the full resolution when printing an 8 by 10, or 11 by 14.