All Forum Comments
Comment by Pentaxophile posted on Monthly Competition #1 - Night Shots discusion at 22/07/2012 - 23:45
http://www.rideau-info.com/photos/mythdpi.html
Quote:
If the pixels of an image do not change, then it has the same digital resolution no matter what number is parked in the DPI/PPI setting of the photo. One factor in the quality of printing to paper is many pixels per inch are delivered to the printer, a number between 200 and 300 is generally accepted to represent "photographic quality" at an arm's length viewing distance. But that quality, the PPI, is determined by how many pixels the image has - not the number parked in the DPI/PPI setting section.
Part of the confusion (and the myth) is generated by the fact that the PPI setting can (and is by some) used to determine the print size on virtual paper. It's often how graphic artists use photo programs, to virtually print size the photo. This has led to the erroneous view that this setting controls the resolution of the digital photo itself. But a digital photo's resolution are its pixels and if those don't change, the photo remains the same resolution.
The DPI/PPI number in the photo is simply a convenient at times conversion factor. Printing on all of today's home printers and most modern commercial printers involves remapping the photo, converting the pixels of the photo into printed dots. This isn't done on a one to one basis, one pixel does not equal one printer dot.
If the pixels of an image do not change, then it has the same digital resolution no matter what number is parked in the DPI/PPI setting of the photo. One factor in the quality of printing to paper is many pixels per inch are delivered to the printer, a number between 200 and 300 is generally accepted to represent "photographic quality" at an arm's length viewing distance. But that quality, the PPI, is determined by how many pixels the image has - not the number parked in the DPI/PPI setting section.
Part of the confusion (and the myth) is generated by the fact that the PPI setting can (and is by some) used to determine the print size on virtual paper. It's often how graphic artists use photo programs, to virtually print size the photo. This has led to the erroneous view that this setting controls the resolution of the digital photo itself. But a digital photo's resolution are its pixels and if those don't change, the photo remains the same resolution.
The DPI/PPI number in the photo is simply a convenient at times conversion factor. Printing on all of today's home printers and most modern commercial printers involves remapping the photo, converting the pixels of the photo into printed dots. This isn't done on a one to one basis, one pixel does not equal one printer dot.
Comment by Pentaxophile posted on Resolution at 22/07/2012 - 22:21
DoctorJeff wrote:
Digital Projections submitted should be 8bit JPEG and at a resolution of 72 pixels/inch (so that entries may be e-mailed).RGB Mode and sRGB Colour Space.
1400 x 1050 pixels Landscape. Max height of portrait to be 1050 pixels.
Surely the 'pixels/inch' bit is irrelevant. It will make bugger all difference to the file size . The key information is 1400 x 1050 pixels, ensuring the image will be at a sufficient resolution for the intended use.Digital Projections submitted should be 8bit JPEG and at a resolution of 72 pixels/inch (so that entries may be e-mailed).RGB Mode and sRGB Colour Space.
1400 x 1050 pixels Landscape. Max height of portrait to be 1050 pixels.
I've 'scanned over' the scantips article - it doesn't seem particularly relevant, as it's all to do with scanning. An 8x6 print scanned at 72ppi is obviously going to be pretty useless if you intend to print it....
Comment by Pentaxophile posted on Resolution at 22/07/2012 - 22:09
johnriley wrote:
The printer dpi has nothing whatsoever to do with this. It only changes the quality at which the 300ppi file is printed.
Then why resize to match the paper size and mess about with the PPI for printing? I am bamboozled by this. Not overly concerned, since I don't think it actually makes a huge amount of difference, but would like to finally get to grips with the logic behind it.The printer dpi has nothing whatsoever to do with this. It only changes the quality at which the 300ppi file is printed.
Comment by Pentaxophile posted on Resolution at 22/07/2012 - 21:01
I w no idea that this classic art-house movie was shot entirely on a Pentax camera! Not the latest HD-DSLR, but using a Spotmatic.
La Jetée (1962):
http://www.youtube.com/watch?v=N_VQQxqzS4M&feature=results_video&playnext=1&list...
La Jetée (1962):
http://www.youtube.com/watch?v=N_VQQxqzS4M&feature=results_video&playnext=1&list...
Comment by Pentaxophile posted on Movie shot on Pentax Camera! at 22/07/2012 - 15:30
Wokingrob wrote:
I haven't edit any of my pics yet i wanna learn to take good pictures before I do that
Sensible. However, after you have resized them it would really help if you sharpened them slightly. Resizing softens the image, and is probably the real reason people are commenting that the pictures aren't sharp! I haven't edit any of my pics yet i wanna learn to take good pictures before I do that
Comment by Pentaxophile posted on New to this at 22/07/2012 - 15:22
I've been annoyed by dealings with the police several times:
- The stop and search mentioned previously.
- A similar incident to Paul's where I was questioned by a plain clothes bobby taking pictures near a Police Station. (In my case, just as I do when my picture taking is questioned by quizzical members of the public, I tried to share my photographic interests with him - hoping perhaps it might make him more understanding of photography. And also, trying to create a more pleasant interaction than being snarky and raising his hackles).
- Being breathalysed and generally held up in my journey for no reason other than stopping to ask a Police Officer a question about whether my vehicle was legal to drive after a small 'parking accident' i had just had (if I had been drinking, would I really have approached a Police Officer???!) This resulted in much eye-rolling from me, but I had inadvertently triggered some sort of procedural chain of inquiry!
However I've always been mindful that the Police are not, as we are led to believe, 'Customer Service Providers', but people in whom we place authority in order to preserve law and order and prevent crime. The police are far, far from perfect (Ian Tomlinson???) but in day to day dealings with the police, I've always seen them as just doing their job. If a little officiously for my liking sometimes.
- The stop and search mentioned previously.
- A similar incident to Paul's where I was questioned by a plain clothes bobby taking pictures near a Police Station. (In my case, just as I do when my picture taking is questioned by quizzical members of the public, I tried to share my photographic interests with him - hoping perhaps it might make him more understanding of photography. And also, trying to create a more pleasant interaction than being snarky and raising his hackles).
- Being breathalysed and generally held up in my journey for no reason other than stopping to ask a Police Officer a question about whether my vehicle was legal to drive after a small 'parking accident' i had just had (if I had been drinking, would I really have approached a Police Officer???!) This resulted in much eye-rolling from me, but I had inadvertently triggered some sort of procedural chain of inquiry!
However I've always been mindful that the Police are not, as we are led to believe, 'Customer Service Providers', but people in whom we place authority in order to preserve law and order and prevent crime. The police are far, far from perfect (Ian Tomlinson???) but in day to day dealings with the police, I've always seen them as just doing their job. If a little officiously for my liking sometimes.
Comment by Pentaxophile posted on photography is not a crime at 22/07/2012 - 11:46
30mm may constrict you. Good opportunity to rent a 16-50mm or 17-70mm from SRS? Otherwise, I would quickly buy a new wide lens. Bad luck; how did it break?
Comment by Pentaxophile posted on 17-50f2.8 broken & 1st wedding in 5 days at 21/07/2012 - 22:18
Pentax have omitted the top LCD on the last three entry level DSLRs - Km, Kx, and the Kr. None of the competitors equivalent cameras have one AFAIK. However, as someone who has had an istDL2, K200, & K7, it's something I'd miss...
Comment by Pentaxophile posted on Pentax K-30 in depth review at 21/07/2012 - 20:36
72dpi is standard Windoze screen res. Macs are 96, I think.
Comment by Pentaxophile posted on Resolution at 21/07/2012 - 13:38
Full size image uploaded to gallery-
Image resized to 800px and sharpened:
How the 800px image looks before you click on it (the 600 pixel wide view)-
The view you get when you click on it-