A measurement of image resolution that defines the size an image will print. The higher the ppi value, the better quality print you will get--but only up to a point. 300ppi is generally considered the point of diminishing returns when it comes to ink jet printing of digital photos.
A measurement of printer resolution that defines how many dots of ink are placed on the page when the image is printed. Today's photo-quality ink jet printers have dpi resolution in the thousands (1200 to 4800 dpi) and will give you acceptable quality photo prints of images with 140-200 ppi resolution, and high quality prints of images with 200-300 ppi resolution.
- Resolution is the measurement of how many dots/pixels fit into one inch.
- The higher resolution the sharper images
- Recommended resolution : 300 dpi for crisp and clear result.
If we are using lower image resolution, image will appear fuzzy, jagged and blurry. Unless if we are using glossary paper because it will give us reflection on our eyes.
In two situation if we are using
a ) resolution = 400 dpi
b) resolution = 72 dpi
The 400 dpi will give crisp image. It will be print smooth. While for the 72dpi it will make image will be fuzzy. This is will printing blur image.
Dpi is for printing. It does not matter to screen or web page if you store 72 dpi there, or 7 dpi there or even 7200 dpi there. It simply does not matter what it says there, because on the screen, that number is ignored. The original correct number is no better on the screen, it only affects printing, on paper, where inches exist.
Even Adobe has problem to understand that. Or they give us what we want, as when saved for the web, Photoshop automatically sets the resolution to 72dpi even if it is meaningless and has no effect in any way on the image or what you see. The numbers affects only the future printing resolution and size? My advise is that you take control yourself! The mythical "72" dpi was maybe fairly accurate once on a PC 14 inch 640x480 VGA display, but way off an 17 1280x1024 inch monitor which might have a resolution of 96dpi.
RULES TO REMEMBER
- Image for printing should be 300dpi at the final size in layout.
- Image which include text should be 400 dpi at the final size layout.
- Resolution and image size are inversely proportional to each other.
- Enlarge image, the resolution decreases
- Reduce the image the resolution increases
- Taking the photo on the highest setting will maximize both the quality of image, as well as the range of sizes at which we will be able to use it in printing object.
PRINT SIZE
The maximum print size that a digital camera can produce is directly related to the number of pixel on the camera's ccd.
Convert pixels to inches (Output to Monitors/Printers)
Formula: Pixels ÷ DPI = Inches
If we know the pixel width and height of an image, this section will calculate the physical size (in inches) of the image when it is printed or displayed on various devices.
To use the calculator, enter the width and height, then select the output resolution which will be used.
* Most monitors display images at approximately 75DPI. To check your own monitor, use the chart below.
* Many printers use a process known as Image Refinement when processing images. This may impact the relation between input and output resolution. Generally, 300DPI is adequate for photo-like prints
Convert inches to Pixels (Input from Scanners)
Formula: Inches X DPI = Pixels
If the catalog will be printed on a 600 DPI printer, the item should be scanned with a resolution of 600 DPI, and care should be taken not to re-size or resample the intermediate image file before printing.
When the output destination is a computer screen, as in the case of auction photos, the scanned image may require further reduction using an image editor before the image is physically small enough to fit on the viewer's screen.
Scanners typically allow the DPI resolution to be adjusted via software. For best results, scanning should be done at the resolution of the intended output device.
Example: a book cover measuring 8 in. by 10 in. will produce an image height of 750 Pixels even when scanned at only 75 DPI. Because many computer displays are set at 800 X 600 Pixels, the resulting photo will be taller that the display area and force scrolling.
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