"SPI, PPI, DPI" matters
May 7, 2023 10:30:05 #
Rongnongno wrote:
The usual push back from folks who are just not paying attention and love GES.
It's from those of us who understand the topic much better than you do.
May 8, 2023 09:50:34 #
According to scientist and photographer Dr. Roger Clark, the resolution of the human eye is 576 megapixels.
May 8, 2023 10:47:56 #
CHG_CANON, the human appendix is useless to everyone except the surgeons that make their fortunes removing them.😜 I think the surgeon that removed mine bought a new boat with the money he received.
May 8, 2023 12:08:03 #
Many folks on this form came to photography via computer technology or are photographers who have a long-standing knowledge of digital technology. I have to admit that I am a "Jonny-Come-Lately" to some of the deep dives into "pixel-peeping" and related science. Not good for me, a commercial photographer who deals with commercial printers and lithographic reproduction of his work on just about every job.
Back in the olden days, it was easier- you needed a print so I put the negative or transparency in an enlarger, and voila! Well, I did have a color lab and a fully equipped darkroom in-house Or, the client or printer would require a certain size of color transparency and that was that- I had every size available from 35mm to 8x10. I would ship the transparencies of the color separation/pre-press folks or the lithographers and be done with it. I'd collect the "tear sheets" and they were always satisfactory to outstanding as to color and resolution, that is unless the client went cheap and bought low-end printing, coarse screes, lousy paper, and ink combinations- I would complain that I delivered top-quality transparency and they print it on "toilet paper"!
All of a sudden- do I have to become a digital scientist and an ophthalmologist and worry about the resolution of the human eye? My approach, as I learned the new ropes is simple- I just do what I am told! The client or printer will tell me their requirements as to size and the DPI requirements and I edit accordingly. I have never had an issue with a lithography printing house, an outsourced printing lab, or anyone else in the "food chain" of image reproduction. I make prints, in-house, up to 30x40 inches. I outsource photomurals and larger display prints. I supply files to lithographic and Xerographic commercial printers. I just keep things calibrated and follow their specifications.
Here's a link to a site that has to do with printing on fabrics, etc- sorry for their ads, but the is a great basic explanation of the terminology and relevance of these technicalities. I am sure some here will take issue with this but it works for me- every day!
https://www.printful.com/ca/blog/everything-you-need-to-know-to-prepare-the-perfect-printfile#:~:text=File%20resolution%20recommendations%3A%20For%20most%20products%2C%20your%20print,check%20File%20guidelines%20when%20choosing%20your%20next%20product.
Back in the olden days, it was easier- you needed a print so I put the negative or transparency in an enlarger, and voila! Well, I did have a color lab and a fully equipped darkroom in-house Or, the client or printer would require a certain size of color transparency and that was that- I had every size available from 35mm to 8x10. I would ship the transparencies of the color separation/pre-press folks or the lithographers and be done with it. I'd collect the "tear sheets" and they were always satisfactory to outstanding as to color and resolution, that is unless the client went cheap and bought low-end printing, coarse screes, lousy paper, and ink combinations- I would complain that I delivered top-quality transparency and they print it on "toilet paper"!
All of a sudden- do I have to become a digital scientist and an ophthalmologist and worry about the resolution of the human eye? My approach, as I learned the new ropes is simple- I just do what I am told! The client or printer will tell me their requirements as to size and the DPI requirements and I edit accordingly. I have never had an issue with a lithography printing house, an outsourced printing lab, or anyone else in the "food chain" of image reproduction. I make prints, in-house, up to 30x40 inches. I outsource photomurals and larger display prints. I supply files to lithographic and Xerographic commercial printers. I just keep things calibrated and follow their specifications.
Here's a link to a site that has to do with printing on fabrics, etc- sorry for their ads, but the is a great basic explanation of the terminology and relevance of these technicalities. I am sure some here will take issue with this but it works for me- every day!
https://www.printful.com/ca/blog/everything-you-need-to-know-to-prepare-the-perfect-printfile#:~:text=File%20resolution%20recommendations%3A%20For%20most%20products%2C%20your%20print,check%20File%20guidelines%20when%20choosing%20your%20next%20product.
May 8, 2023 12:37:39 #
May 8, 2023 13:15:32 #
May 8, 2023 14:38:57 #
May 8, 2023 15:02:26 #
May 8, 2023 17:06:50 #
JohnR wrote:
You all got nothing better to do?
Better than complaining....
May 8, 2023 17:37:49 #
E.L.. Shapiro wrote:
br br Here's a link to a site that has to do wit... (show quote)
Well worth the read. Thank you.
May 8, 2023 18:22:45 #
May 8, 2023 18:25:05 #
May 8, 2023 18:28:03 #
davyboy
Loc: Anoka Mn.
Rongnongno wrote:
The usual push back from folks who are just not paying attention and love GES.
Maybe they just love normal
May 9, 2023 05:08:47 #
davyboy wrote:
Maybe they just love normal
That is fine, as long as they do not try to invalidate what is being said:
SPI, PPI and DPI are relevant when scanning (or taking a picture) and using the capture on a display or a print.
When scanning or capturing an image, the sensor array density relates to the detail captured (sensors too small this may create several issues - too complex for this thread).
When using the image as a final product, the media has physical limitations that (must) be taken into account to produce the best image according to the device used.
If one does not want to take the final product in consideration, that is fine, I have no objection. Just do not come out and type I do not understand anything. They are looking at apples when I speak/type about oranges.
I will question these folks' sanity if they turn around and select cameras in function of their capture size in pixels... If it does not matter, why the heck do they purchase/use expensive cameras when a cheap 8PM camera will do the job?
May 9, 2023 07:32:24 #
Rongnongno wrote:
That is fine, as long as they do not try to invali... (show quote)
Remind the disbelieving UHH community where you set the "SPI, PPI, DPI" value in your digital camera? Any model or any brand?
If you want to reply, then register here. Registration is free and your account is created instantly, so you can post right away.