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Resolution of photo paper?
What's the resolution of photo paper? Googling for terms
such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? I just bought a 10D. I am going to print primarily 4x6's and I've decided to scale down the raw image to 75% (2304x1536) to generate jpegs suitable for printing at 4x6. This gets me 384 dpi. I found that when printing the same G3 photo at 4x6 and 5x7 (378 dpi vs. 324 dpi) that I could discern the difference in detail and the the 4x6 had a noticably more tack-sharp quality, but this could be due to the sharpening settings being more optimal for the 4x6 print. Here are some of the first images from my totally digital 10D (not to be confused with the totally obsolete D60 ). I'm using Breezebrowser with quality factor 99. This keeps all my images under walmart.com's 3MB upload limit. http://w3.kill-9.com/batterypark.jpg http://w3.kill-9.com/liberty.jpg http://w3.kill-9.com/relative.jpg Andrew |
#2
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Andrew wrote:
What's the resolution of photo paper? Googling for terms such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? I just bought a 10D. I am going to print primarily 4x6's and I've decided to scale down the raw image to 75% (2304x1536) to generate jpegs suitable for printing at 4x6. This gets me 384 dpi. I found that when printing the same G3 photo at 4x6 and 5x7 (378 dpi vs. 324 dpi) that I could discern the difference in detail and the the 4x6 had a noticably more tack-sharp quality, but this could be due to the sharpening settings being more optimal for the 4x6 print. Here are some of the first images from my totally digital 10D (not to be confused with the totally obsolete D60 ). I'm using Breezebrowser with quality factor 99. This keeps all my images under walmart.com's 3MB upload limit. http://w3.kill-9.com/batterypark.jpg http://w3.kill-9.com/liberty.jpg http://w3.kill-9.com/relative.jpg Andrew As you know sharpness can't really be measured. It is perceived by the human eye. Not only that, but each of us sees a little different. Most authorities seems to believe that about 300 DPI is it. More is OK, but few if anyone will be able to see the difference. Less than 300 DPI and people start being able to notice the difference. As you have noted other factors like sharpening settings and sampling of a larger image can be more important. -- Joseph E. Meehan 26 + 6 = 1 It's Irish Math |
#3
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Andrew wrote:
What's the resolution of photo paper? Googling for terms such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? I just bought a 10D. I am going to print primarily 4x6's and I've decided to scale down the raw image to 75% (2304x1536) to generate jpegs suitable for printing at 4x6. This gets me 384 dpi. I found that when printing the same G3 photo at 4x6 and 5x7 (378 dpi vs. 324 dpi) that I could discern the difference in detail and the the 4x6 had a noticably more tack-sharp quality, but this could be due to the sharpening settings being more optimal for the 4x6 print. Here are some of the first images from my totally digital 10D (not to be confused with the totally obsolete D60 ). I'm using Breezebrowser with quality factor 99. This keeps all my images under walmart.com's 3MB upload limit. http://w3.kill-9.com/batterypark.jpg http://w3.kill-9.com/liberty.jpg http://w3.kill-9.com/relative.jpg Andrew As you know sharpness can't really be measured. It is perceived by the human eye. Not only that, but each of us sees a little different. Most authorities seems to believe that about 300 DPI is it. More is OK, but few if anyone will be able to see the difference. Less than 300 DPI and people start being able to notice the difference. As you have noted other factors like sharpening settings and sampling of a larger image can be more important. -- Joseph E. Meehan 26 + 6 = 1 It's Irish Math |
#5
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Subject: Resolution of photo paper?
From: Andrew Date: 8/31/2004 7:14 AM Pacific Standard Time Message-id: What's the resolution of photo paper? Googling for terms such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? I just bought a 10D. I am going to print primarily 4x6's and I've decided to scale down the raw image to 75% (2304x1536) to generate jpegs suitable for printing at 4x6. This gets me 384 dpi. I found that when printing the same G3 photo at 4x6 and 5x7 (378 dpi vs. 324 dpi) that I could discern the difference in detail and the the 4x6 had a noticably more tack-sharp quality, but this could be due to the sharpening settings being more optimal for the 4x6 print. Here are some of the first images from my totally digital 10D (not to be confused with the totally obsolete D60 ). I'm using Breezebrowser with quality factor 99. This keeps all my images under walmart.com's 3MB upload limit. http://w3.kill-9.com/batterypark.jpg http://w3.kill-9.com/liberty.jpg http://w3.kill-9.com/relative.jpg Andrew In a series of tests I ran years ago for Modern Photography I came up with 8 lines per mm . Arthur Kramer 344th BG 494th BS England, France, Belgium, Holland, Germany Visit my WW II B-26 website at: http://www.coastcomp.com/artkramer |
#6
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In article , Andrew
writes What's the resolution of photo paper? Googling for terms such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? What do you mean by "photo paper"? From the words, I would take it to mean traditional light-sensitive emulsion coated paper; for this, maximum resolution is probably around 60-70 lp/mm - and this for good B&W papers, most colour neg/pos paper would probably be lower. Note however that 60-70 lp/mm is way in excess of what the keenest human eye can detect; that limit is closer to 30 lp/mm. If you mean inkjet paper, I don't know, but I suspect the printer has more control over this than the paper - not that the paper has no influence. David -- David Littlewood |
#7
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In article , Andrew
writes What's the resolution of photo paper? Googling for terms such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? What do you mean by "photo paper"? From the words, I would take it to mean traditional light-sensitive emulsion coated paper; for this, maximum resolution is probably around 60-70 lp/mm - and this for good B&W papers, most colour neg/pos paper would probably be lower. Note however that 60-70 lp/mm is way in excess of what the keenest human eye can detect; that limit is closer to 30 lp/mm. If you mean inkjet paper, I don't know, but I suspect the printer has more control over this than the paper - not that the paper has no influence. David -- David Littlewood |
#8
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In a series of tests I ran years ago for Modern Photography I came up with 8 lines per mm . Arthur Kramer 344th BG 494th BS England, France, Belgium, Holland, Germany Visit my WW II B-26 website at: http://www.coastcomp.com/artkramer Is that 8 lines or 8 line pairs per mm? 8 lines would be roughly equivalent to 200 dpi (8*25.4 mm/in) 8 line pairs would be roughly 400 dpi |
#9
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In a series of tests I ran years ago for Modern Photography I came up with 8 lines per mm . Arthur Kramer 344th BG 494th BS England, France, Belgium, Holland, Germany Visit my WW II B-26 website at: http://www.coastcomp.com/artkramer Is that 8 lines or 8 line pairs per mm? 8 lines would be roughly equivalent to 200 dpi (8*25.4 mm/in) 8 line pairs would be roughly 400 dpi |
#10
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"Joseph Meehan" wrote in message ... Andrew wrote: What's the resolution of photo paper? Googling for terms such as dpi and noritsu, I came across marketing claims from minilab manufacturers claiming 400 and 500 dpi. Is the the current bottleneck the paper or the equipment used to project light onto the paper? I just bought a 10D. I am going to print primarily 4x6's and I've decided to scale down the raw image to 75% (2304x1536) to generate jpegs suitable for printing at 4x6. This gets me 384 dpi. I found that when printing the same G3 photo at 4x6 and 5x7 (378 dpi vs. 324 dpi) that I could discern the difference in detail and the the 4x6 had a noticably more tack-sharp quality, but this could be due to the sharpening settings being more optimal for the 4x6 print. Here are some of the first images from my totally digital 10D (not to be confused with the totally obsolete D60 ). I'm using Breezebrowser with quality factor 99. This keeps all my images under walmart.com's 3MB upload limit. http://w3.kill-9.com/batterypark.jpg http://w3.kill-9.com/liberty.jpg http://w3.kill-9.com/relative.jpg Andrew As you know sharpness can't really be measured. It is perceived by the human eye. Not only that, but each of us sees a little different. Most authorities seems to believe that about 300 DPI is it. More is OK, but few if anyone will be able to see the difference. Less than 300 DPI and people start being able to notice the difference. As you have noted other factors like sharpening settings and sampling of a larger image can be more important. -- Joseph E. Meehan 26 + 6 = 1 It's Irish Math A REALLY major factor in perceived sharpness (and often overlooked) is the ability to produce continuous tones. I've seen 200 dpi look great and 600 dpi look terrible based on this factor alone. As for the OP's question (which sounded to me like a photographic limitation question), some of the best macro lenses only resolve slightly over 100 lp per inch. George |
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