GoImage Guidance Image Quality - Test of SlideShare Usage
- 1. Β© 2009-14 GoImage Media Services Inc. Suite 205 140 Cedar Island Rd. | Orillia, ON Canada L3V 1T1 | (705) 326-7793 GOI M A G E M E D I A S E RV I C ES GuidanceIMAGE QUALITY Why Are You Asking for Original Images? Every time an image is resized, compressed, or saved in a diο¬erent format, you lose a little bit of the original image quality. This can happen in many ways. If you make the original image smaller, the editing program will make its best estimate of which pixels to forget, and which pixels to combine. If the image is enlarged, the editing program will βextrapolateβ its best guess as to what the image should look like. When you resave an image, you can lose quality two diο¬erent ways. JPG is a βlossyβ image format. You will ALWAYS lose some image information on the save. PNG is considered a βlosslessβ format, but you can still lose image information, if you change the color space that records the image. Saving to a PDF can also result in color changes and/or loss of reso- lution. This is largely governed by how you export/print your PDFs. This loss of detail can happen every time the image is changed and resaved. For old images that have doubtful origins, they may have lost an immense amount of the detail that existed in the original. Donβt You Compress Images? All the time, but we always begin our editing with the best source file available. In a perfect world, this would be the file created by the camera, or in the case of non-digital original material, the first and highest resolution scan available. We save this original image as our source file for all future editing. Admittedly, this takes up a lot of stor- age space, but we think your project is worth it. This allows us to have the highest possible quality in the finished image, whatever size or usage it may be ultimately destined for. Simply Donβt Have an Original If you donβt have the original image, we will do our utmost to get the highest possible quality out of the image you provide. We use various digital tools that allow for enhancement and modification of lower quality images. In rare cases, we may recommend against the use of an image because it will significantly reduce the overall visual impact of your project. Original 3870 px wide Same area after image reduced to 1000 px wide with βmediumβ JPG compression 320px wide section of original