Why do you think the resolution of your images should be 600PPI?
Yes...do you think there will be a problem with the prints?
Unless this is some kind of super high end coffee table book, nobody is going to notice.
600ppi is overkill for almost everything. What makes your boss think it’s needed?
Haha! Well, I guess she wants to have the best possible result...
Thanks for your answers!
600 ppi is NOT going to yield superior results to 300. In fact with most printing, it probably won’t even better than 200 or so.
Okey, then! I am getting the prints and hope they will be fine!
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What is the viewing distance for these prints and the sort of detail in the images? Resolution depends on viewing distance and 300 ppi is the rule of thumb for "arms' length" viewing. Lots of fine detail at a close viewing distance might need a higher resolution, but poster-sized work viewed from across a room would be fine at 300.
There is a very good discussion of this at Distance-Resolution Formula
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Was it digitally or litho printed?
For digital, 200 would be fine and going any higher is probably not necessary as digital printing is bit more forgiving than litho.
For litho it would depend on their LPI settings.
Newspaper printing is usually set at 80-120 LPI
Typical magazine printing is 120-150 LPI
Higher end art/coffee table books are usually 150-200 LPI
It's the LPI you multiply by 1.41 to get the optimal DPI for printing.
1.41 x 120LPI = 169.2 DPI
1.41 x 150LPI = 211.5 DPI
1.41 x 200LPI = 282 DPI
For 600 DPI printing - the LPI would need to be 425 - which just doesn't happen anywhere in the known universe.
It's unusual, but an exception would be if you had detailed colored line art or a line art like image where there are no halftone dots interfering with the edge transition from black to white or black to a color. Something like a colored engraving.
Also the export compression settings only let you down sample, you can't increase resolution via export.
You can increase the resolution on export through a transparency flattener preset
There are of course exceptions to every rule - for example, grayscale images don't need to be the same resolution. And a scene with low definition, like foggy scenes, no sharp lines etc. doesn't need to be the same hi-res as images that have hi-contrast sharp edges and lots of details.
The Boss is always right!
Like the time the Boss asked for the type to be larger, it was already 14pt, so I just zoomed in until he said "Perfect". It was printed and never a word said.
Vector graphics is printed at the highest possible resolution, as it is the printers rip that creates the bitmap based on what the printer needs. That's important, as text tends to get washed out at 200dpi and lower.
as a rule of thumb, anything that is viewed at a standard viewing distance (like books), the resolution should be somewhere between 200 and 300 dpi for photographs (not graphics with crisp borders, those are best as vector graphics see above).
Some prints on special paper ask for 400dpi.
Posters viewed at some distance may be lower resolution. The farer away, the lower the resolution. We print banners of 2m at around 100dpi.
That is not at all a good attitude. When the boss is wrong you point it out along with an explanation of why.
for example, grayscale images don't need to be the same resolution.
Thank you all for your replies!
It's pictures of people in colour. Printed digitally to be hung on the wall. Dimensions are 15x30 cm - I had it wrong at the beginning.
I did a little test print on our normal office printer today and the colours were a little off...but maybe you will not be able to see the difference, without having the other to compare it to.