![]() ![]() It is at this point, I need to know the optimal PPI setting for the image to feed the printer as well as the desired output size. I am printing a photograph on fine art photographic paper. 300 dpi is fine for laser printer text on copy paper. How? By using the resampling engine in Perfect Resize to fill in the blanks to make an internal resolution of 300ppi for a 16x20 output.Īctually, I'm not confused at all. Yet, I have made successful 16x20 prints from iPhone images for many customers. That's where the 8Mp comes from and this means ostensibly that the native print size at 300ppi would be just slightly larger than 8x10. I say this because the iPhone is a popular pocket camera and the 8MP versions have sensors with 3264 x 2448 pixel coverage. And, unless the photograph is not very good, this can look superb when viewed at a proper viewing distance. ![]() However, for this size of output, I would need to resample the original file and have Photoshop or Perfect Resize create new pixels to fill the gaps in to bring the file internal resolution back to 300ppi. This is really important so we will come back to it later on. That may actually look just fine, because we as yet have not considered the optimal viewing distance for the image. ![]() Without resampling, the image will be giving me just under 51 pixels per inch. I want the image to print 12 feet or 144 inches wide. Thus to keep the ppi resolution the same, I must throw pixels away. If resampling does not do this, reducing the output size to 8 inches on the short side, drives the ppi to 685 pixels per inch which is more than the print house wants. For example, if I want a 300ppi image from the Hasselblad file with the intent to produce an 8x10 print, the resampling process must throw pixels away to make that happen given my default deliverable size of 300ppi. They do this because they want to avoid having to digitally resample the image. If 1ppi were the same as 1dpi, then that would be accurately true, and while not the same thing, it is used as a means to assess what the maximum default print size is, as an approximation.Ī print house may request an image at a certain PPI. This is what we would consider the default print size at 300 pixels per inch. If I open a file from my 40MP Hasselblad and set 300 pixels per inch, I get a default image size of 24.35 x 18.26 inches. When I open the Image Size dialog in Photoshop, it tells me the maximum native print size at a certain number of pixels per inch for a given file. A mental equation gets created in our editing software that pixels per inch is the same as dots per inch and this is not true. Most times this is erroneously equated to text where we know that 300 dots per inch looks nice, and 600 dots per inch, looks really special. One way to look at this is what we see as good quality print. Serious creatives start to think about making a print and the water gets very muddy. You might as well just shoot with a smartphone. All the fine gradations and quality are lost on the web or social media viewer. ![]() Your digital file is WAY better than this and yet for many folks, a web view is the only view ever seen of the image. Note that some devices will have a higher resolution. The reality is that common web viewing device resolution is stated to be by makers about 72 dots per inch although we really are measuring pixels per inch. We start to think about making a web ready image and start working really hard. What we see when buying is a rating of about 30 megapixels and we figure that's pretty darn good and we'd be right. This gives us a pixel area of 28.73 micrometers per photo receptor. In this example, that is 6720 x 4480 photo receptors, each being about 5.36 micrometers apart. When we look at cameras, we are sometimes concerned with the megapixel count, which is really the number of unique photo receptors on the sensor. I choose this only because it is a relatively common camera. For the example, I will use a sample image from a Canon 5D Mark IV. ![]()
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