Pixels per inch The number of pixels in one inch of paper. A measurement for digital photos/images. Higher resolutions results in smaller photos but better image quality. Good quality printing requires 300 ppi (standard).
Pixel Dimensions and Document Size
200 pixels/inch 72 pixels/inch
Source: bestprintonline; mgxcopy
Printing control 72 pixels/inch 200 pixels/inch
Dots per inch The number of dots of ink on the page when the image is printed. A measurement for printing devices. A printer may put down several dots to reproduce one pixel. Suitable ppi from image + high dpi from printer = good quality printed image.
SAMSUNG CLP-325 HP INKJET 4200n Source: HP websiteSource: Samsung website
Other concepts Resizing and Resampling: http://www.youtube.com/watch?v=-_1j1f2Qh20 http://www.webdesignerdepot.com/2010/02/the-myth-of- dpi/ Bitmap (raster) and vector images: http://graphicssoft.about.com/od/aboutgraphics/a/bitma pvector.htm Samples Per Inch (SPI), Lines Per Inch (LPI): http://desktoppub.about.com/cs/intermediate/a/meas_re solution.htm Compressions and file formats: http://www.library.cornell.edu/preservation/tutorial/intro/int ro-07.html
Resources Adobe. (n.d.). Image size and resolution. Retrieved February 14, 2013, from Adobe Help: http://help.adobe.com/en_US/photoshop/cs/using/WSfd1234e1c4b69f30ea53e4100 1031ab64-7945a.html Binder, B. (2011, March 8). Adobe InDesign: Why Do my Images Look So Bad? Retrieved February 14, 2013, from ROCKY MOUNTAIN TRAINING blog: http://blog.rockymountaintraining.com/?p=1799 Campbell, Long, M., & Dave. (2007). Digital Photography for Teens. In Making Prints (pp. 251-271). Boston, MA, USA: Course Technology / Cengage Learning. Dacey, A. (n.d.). DPI and PPI Explained. Retrieved February 14, 2013, from andrewdaceyphotography: http://www.andrewdaceyphotography.com/articles/dpi/ Johnson, Tobie, H., & David, C. (2004). Digital Printing Start-Up Guide. Boston, MA, USA: Course Technology / Cengage Learning . Spooner, C. (n.d.). A Handy Guide to Image Resolutions in Print Design. Retrieved February 14, 2013, from SpoonGraphics: http://blog.spoongraphics.co.uk/articles/a- handy-guide-to-image-resolutions-in-print-design Virgilli, S. (2012, February 9). Pixels, Dots and Resolution. Retrieved February 14, 2013, from Vox Lab Youtube Channel: http://www.youtube.com/watch?v=JZVlpCIAUMo