![]() See a printing guideline for the resolution needed for several common purposes. It's generally about what our eye is capable of seeing, but varies with the media. More than 300 dpi really can't help photo prints, but less than 200 dpi can suffer less image quality. But planning image size to have sufficient pixels to be somewhere around 240 to 300 pixels per inch is a very good thing for printing, called "photo quality". But this dpi number does NOT need to be exact, 10% or 15% variation won't have great effect. Printing photos at 250 or 300 dpi is considered very desirable and optimum. Photos are preferably done on a photo quality printer and photo paper.įile size is shown at The Four Sizes of a Digital Image below To do that, scan and print just have to be the same dpi number, but 300 dpi will be a great number for a high quality print. TIP: If you both scan and then print at the same dpi, it will print a copy at the same original size.Meaning, if you want to print 8×10 inches at 300 dpi, then you need 2400×3000 pixels. Printing: It also calculates the required image size (pixels) to print this image size (inches or mm) on paper at the dpi resolution.ģ000×2400 pixels printed at 300 dpi will print (3000 pixels / 300 dpi)×(2400 pixels / 300 dpi) = 10x8 inches on paper.The calculator shows that if you scan a 6×4 inch print at 100 dpi, it will create a 600×400 pixel image, and the monitor will show it at that same 600×400 pixel size. Video monitors: Video does not use dpi, but scanners do.Your scanner program probably shows you the same information. Scanning: It calculates the scanned output image size created if the area is scanned at the dpi resolution.Self.This little calculator has these purposes: (or there's another fancier calculator) Usage let pdfUrl = URL(fileURLWithPath: "PDF URL") Flip the context vertically because the Core Graphics coordinate system starts from the bottom. Translate the context so that we only draw the `cropRect`.Ĭtx.anslateBy(x:, y: - ) Let renderer = UIGraphicsImageRenderer(size: pageRect.size)Ĭtx.fill(CGRect(x: 0, y: 0, width: pageRect.width, height: pageRect.height)) Fetch the page rect for the page we want to render. Paint each pages content to an image andįor (int i = 0 i < document.getNumberOfPages() i ) ("Error encryption not supported " ex) Import .GraphicsRenderingHints ĭtFile("C:\\Users\\Dell\\Desktop\\test.pdf") I use icepdf an open source java pdf engine. ![]() ![]()
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