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Enlargement Photoshop

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Old 05-04-2016, 11:17 AM
Tony W's Avatar
Tony W Tony W is offline
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Re: Enlargement Photoshop

Originally Posted by alreese83 View Post
Yes, it is a print that was scanned at 600, so there is grain...a lot. No, I do not have access to the RAW file, and I am not printing it myself. It is a wedding portrait, that's going to be softened in various places. Thanks for all of the advice / tips, will work according to. But what is SPI?
SPI = Samples Per Inch and is a measurement of the resolution of the scanner. The more samples per inch, the higher the quality of the scanned image. It is in my opinion a more accurate way of describing a scanners output rather than DPI and can avoid confusion as the terms seem to be freely mixed at times

“Dot Per Inch” a measure of printing resolution. DPI is sometimes used instead of SPI but should be reserved for times when referring to print output. Sometimes called Dots Per Inch this in most cases is not quite correct as in printer terms it should be seen as a measure of volume or Droplets Per Inch (usual to quote in picolitres - 1 trillionth of a litre)
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Old 05-04-2016, 01:51 PM
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andrewrodney andrewrodney is offline
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How many pixels?

Originally Posted by alreese83 View Post
Yes, it is a print that was scanned at 600, so there is grain...a lot.
600 (PPI or whatever) tells us nothing!
You are referring to what is a resolution tag and it's rather meaningless. It could be 72PPI or 180PPI or 600 PPI but it doesn't have an inherent meaning, only what you could produce with the number of pixels you have at your disposal. Work with pixels! For example, let us say you have 1000x1000 pixels to keep the math simple. And to simplify this further, let's only consider the horizontal axis. If you have 1000 pixels and divide that by 72, that is, you provide 72 pixels per inch, you could end up with 13.8 inches using that division (1000/72=13.8). Let's now say you divide up your 1000 pixels using 180 instead. 1000/180=5.5. In both cases, you had 1000 total pixels. The document itself doesn't have a size, other than what space it takes up on your hard drive. The sizes above are examples of what could be produced if you divided up the total number of pixels you have, with some number of which is just a tag within the document. In Photoshop, if you use the Image Size dialog, turn resample OFF (do not allow it to create more or remove pixels), you can enter any value, 72, 180, 1000 into the resolution field and the resulting size is calculated for you. But you haven’t changed the document or the data at all. You just changed a theoretical 'size' if you output your 1000 pixels using that resolution. So again, it's meaningless until you output the data. At that point, lets say you print the image, you can decide how big you wish it to appear and/or how many pixels you want to devote to the output. You have 1000 pixels and someone tells you that you must use 300DPI (which isn't true but that's a different story). 1000/300 would produce a 3.3 inch print. You want a bigger print? Lower the DPI (within reason). You set the DPI for output to use 180 of your pixels to produce 180DPI? You get a 5.5 inch print (1000/180=5.5).

Work with pixels. That's a fixed attribute of the data unless of course you resample that data (add or remove pixels).

So, how many pixels WxH do you have?
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Old 05-04-2016, 10:26 PM
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alreese83 alreese83 is offline
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Re: Enlargement Photoshop

Using VueScan also has proven helpful. This"little" project has totally expanded my knowledge on both on scanning and enlargement! Oh, and color management. Once again thanks for the input and rethinking tips, yet another vocabulary to learn.
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Old 05-09-2016, 06:48 AM
Sahana Chawla Sahana Chawla is offline
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Re: Enlargement Photoshop

Enlarge the image before doing retouch,so that you can rectify any artifacts which occured while resize the image
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