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EyeballPaul
Guest
I just got a stack of prints back from our local Agfa lab, and notice a problem that I'd also seen before on a few prints I'd got done with them.
Let me first make the mention this is NOT the usual low-res jaggies or jpeg artefacts. I've been working in both print and video graphics for 10 years now and this is different.
I got a bunch of prints done at instant photo kiosks in Japan and none of them had this problem.
--
Firstly there was a lot of weird aliasing artefacting on diagonals, especially between high contrast areas. This was a bit unusual as it seems rough and uneven. It's not the same every step. It looks like when you enlarge in photoshop to a size other than a multiple, without using bicubic resampling.
Second, there it looked like the image was converted into uniform blocks in certain areas. This did not look like the usual jpeg dirty compression.
These prints were in 1024x683 or 1600x1068 res. Now remember that I printed these and they looked GREAT from an instant kiosk.. but from the photo lab look whacked. In fact, my lo-res 640x427 shots actually came out better at the lab than my higher res ones.
Also, do these labs enlarge before printing? I supplied my images at 15cm x 10cm.. the correct aspect, but it looks like they've been enlarged and then cropped by at least 0.5cm all around! Is this a normal procedure? I read a mention somewhere about over-sharpening? Is this a possible cause? However, even if I don't adjust my images at all, they still come out whacked
Last, when I look at the prints with my lupe, the Agfa one is made of dots. These dots are arranged in a uniform grid with slight white space between. I thought photos were meant to be continous tone? When I look at the ones from the instant kiosk they are continuous tone! No dots to be seen at all.
Well, if anyone can offer any assistance I'd greatly appreciate it. I'm not really happy with the results. Thanks.
Let me first make the mention this is NOT the usual low-res jaggies or jpeg artefacts. I've been working in both print and video graphics for 10 years now and this is different.
I got a bunch of prints done at instant photo kiosks in Japan and none of them had this problem.
--
Firstly there was a lot of weird aliasing artefacting on diagonals, especially between high contrast areas. This was a bit unusual as it seems rough and uneven. It's not the same every step. It looks like when you enlarge in photoshop to a size other than a multiple, without using bicubic resampling.
Second, there it looked like the image was converted into uniform blocks in certain areas. This did not look like the usual jpeg dirty compression.
These prints were in 1024x683 or 1600x1068 res. Now remember that I printed these and they looked GREAT from an instant kiosk.. but from the photo lab look whacked. In fact, my lo-res 640x427 shots actually came out better at the lab than my higher res ones.
Also, do these labs enlarge before printing? I supplied my images at 15cm x 10cm.. the correct aspect, but it looks like they've been enlarged and then cropped by at least 0.5cm all around! Is this a normal procedure? I read a mention somewhere about over-sharpening? Is this a possible cause? However, even if I don't adjust my images at all, they still come out whacked
Last, when I look at the prints with my lupe, the Agfa one is made of dots. These dots are arranged in a uniform grid with slight white space between. I thought photos were meant to be continous tone? When I look at the ones from the instant kiosk they are continuous tone! No dots to be seen at all.
Well, if anyone can offer any assistance I'd greatly appreciate it. I'm not really happy with the results. Thanks.