Uncompressed file size = Resolution in dpi (horizontal ) x Resolution (vertical) x Height (inches) x width (inches) x color depth Example 1 scanning an page in 0 dpi in B&W = 0 x 0 x 7 x 1169 x 1 = 3,867,052 bits = 4,381 bytes = 472 Kb Approximate size of an uncompressed image scanned @ 0 dpi / B&W = 500 Kb / 05 Mb If file size is not an issue but density is important, go ahead and scan at DPI Anything denser than 400 DPI there is no visual difference unless a requirement is to zoom into the drawing The more dots per inch, the better image will be displayed on aIf you'll want to more than double the size of the original photo, go even higher with the dpi At 900 dpi, a 4×6inch printed photo turns into a 16×24inch digital image If the original photo is small, scan at 600 dpi or higher If you scan a 2×3inch photo at 10 dpi, for example, it will become a 16×24inch digital image without
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Is 300 dpi better than 600 dpi
Is 300 dpi better than 600 dpi-100–0 for a thumbnail image 72 DPI JPEG –0 K Printed in a book or art magazine768 ÷ 300 = 256″ (height) So, you could print this 1024px × 768px image at 300 DPI at a size of ″ × 256″ – any bigger than this, and you risk the image becoming pixellated Sure, you can enlarge the image a teeny, tiny bit beyond this size, if you need to, but it's best if you don't
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Ignore kb for now Your image has 1400 pixels (or DOTS) on one edge by 2100 pixels on the other It can be shrunk to make more DOTS PER INCH, or enlarged to make less For example, if you make it 300 DPI, it becomes x 7 inches 1400÷300 by 2100÷300 If you choose 150 DPI, you divide by 150 instead (roughly 9x14 inches) So if you had an image that was 600 pixels tall, and you printed at 300 ppi, you'd end up with a print that is 2 inches tall (because 600 pixels at 300 pixels per inch gives you 2 inches in total) What, then, is the point of DPI?Good results for printing yields 300 DPI, but it is better to apply 600 DPI The DPI for the image to be printed is largely dependent on the printer (or plotter) on which it is printed There are printers and plotters with a resolution of 2400 DPI or more Next, the DPI you choose is highly dependent on how you intend to use the image
For example, 600 dpi is considered the best resolution for scanning black and white photos 2 Scanning at 300 vs Scanning at Higher dpi You'll get the exact copy of the original photo if you scan it at 300 dpiOr 768 pixels high for a vertical one 102 DPI JPEG 300–600 K Web site About 400–600 pixels wide for a large image;At 600 DPI your 2" x 2" photo is converted into a 10 x 10 digital photo At 10 x 10 you can display your digital photo on you HDTV at excellent quality And that is the point here once you understand how resolution works, then you have more control You can scan all your photos at 900 DPI and archive them
If you want files that are easier to work with, 300 DPI scans would be a better choice 600 DPI Scans Allow for Double the Enlargement Part of the benefit of scanning your old photos, in addition to the added security of backing them up in a digital format, is the ability to create new prints, enlargements and photo products such as photo books For example, if you scan a 4×6 photo at 300 DPI, you'll receive a digital image that's 10 pixels wide and 1800 pixels tall Scanning the same photo at 600 DPI will give you a digital photo that's 2400 pixels wide and 3600 pixels tall Larger DPI scan resolutions are great if you want to display or print larger photographsWhen you use 600 DPI to scan that photo, you're not adding more detail At 300 DPI, you have all the detail possible If you use 600 DPI, all you're doing is doubling the SIZE of your 4x6 And you're doubling the size WITHOUT losing any detail (not adding detail) 3 Why Scan Your Photos Bigger Than 300 DPI Say you scanned your photos at 300 DPI
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Image resolution is directly and inversely proportional to an image´s physical size When you increase the resolution of an image, reduce its size When you enlarge an image, lower the resolution Otherwise, the image will print poorly For printed images, the ideal resolution is 300 dpi for images and 400 dpi for text at the final printed sizeThe lowest DPI that is needed for the scanned text to display and print properly is 300 DPI If the text is going to be reprinted, a DPI setting of 600 or better is ideal When saving text documents it is best to save the files as PDF (portable document format)If you up this to 300 dpi, then the size increases to 62K – not a big difference on its own, but it adds up over the many pages of a long document Best DPI for Scanning BlackandWhite Documents For true, highquality scanning, or for text that is going to be reprinted, you can go up to 600 dpi
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So for printing an ID card, most image files are too small to see any better clarity in 600dpi over 300dpi 600dpi printing also takes longer to print each card and reduces the lifetime of the print head due to the increased workload So 300dpi is your best bet But you want a clearer photo on your id badges right?Even lowresolution files or files that were resampled and thrown into a 150 DPI template, don't seem nearly as low quality in this print as they do on the screen This is why having a 300 DPI file won't have a big impact on the quality of sublimation products Well, a digital photo is just a cluster of different pixels To get a PPI number for any digital photo you need to know the intended display or print size Simply requesting a 300 PPI (or DPI) image is meaningless, you need to also know the size at which it
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To calculate the resolution in megapixels, multiply the number of pixels of length and width and divide them by mega (1 million) pixel x = 300 dpi * 13 mm / 254 mm = 1535 pixel pixel y = 300 dpi * 18 mm / 254 mm = 2126 pixelTo get an 85" x 11" print at 300 ppi, you're going to need a digital image that is 2550 (85 x 300) by 3300 (11 x 300) pixels in size To scan 4 inches to 2550 pixels will require a DPI of 638 (2550 divided by 4) To scan 6 inches to 3300 pixels will require a DPI of 550 (3300 divided by 6) If you have 450 dpi, give it 450, or 625 dpi or whatever your file and print size turns out to Because whenever your resolution exceeds the 300 dpi
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300 DPI is the standard because that's the resolution most people can see at the typical reading distance of one foot (see the first table above) Hence, virtually all printers print at a minimum of 300 DPI Many printers can print 600 DPI or higher, but that is overkill for the average viewing distance You can do a file in a page size with 100 or 300 DPI without changing the dimensions of the image, just adding more dots of color and making it sharper Image size is quality? Usually for a colored page/picture 300/350dpi are fine, but with Greyscale and Raster you go for 600 dpi so the lines stay sharp There was even a situation where I needed to deliver my comicpages (Pure Black and White) in 10 dpi for printing
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