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質問

Is it bad if the PPI of a graphic is much larger than 300?

Forum|Forum|1 year ago
December 6, 2024
返信数 4.
1021 ビュー

Hi,

I am working on graphics and diagrams for a book layout and when I place them in InDesign, the PPI is much higher than 300. Does that matter, or is it not an issue as long as it's above 300?

The graphics are very simple, mostly just shapes and lines.

Thank you!

How to

このトピックへの返信は締め切られました。

Dave Creamer of IDEAS

Community Expert

Generally, an image with TOO high a resolution can look slightly soft.

David Creamer: Community Expert (ACI and ACE 1995-2023)

Robert at ID-Tasker

Legend

@Mateomono

Can't you have them as vectors?

M

Mateomono作成者

Known Participant

@Robert at ID-Tasker
Is that possible? I was under the impression that you cant for print project. Also by vectors you mean placing them as svgs?

Robert at ID-Tasker

Legend

@Mateomono

Can't what? Use vectors? Of course you can. And if you have vector version - then you SHOULD use it instead of a "bitmap".

SVG is one of the formats - but there are many more - the best one would be AI / PDF - which, technically, is the same.

Willi Adelberger

Community Expert

Graphics should be not pixelated images at all. You should either use PDF/X-4 or AI files.
Images higher than 300 ppi will be recalculated as the joboption definition is set up. A higher resolution than the defined threshold will bevrecalculated and not cause a better quality, but the contrary is the case. The downrecalcatinf can end up in a worse quality.

James Gifford—NitroPress

Legend

I missed the line about images being shapes and lines — perhaps an edit there?

It's also not clear whether the OP is intending this for print, PDF, e-book or other destination..

But yes, diagrams, charts and the like are best created as vector elements, either AI or PDF, so that export resolution to PDF/print is maximized. OTOH, 300 ppi/dpi is likely what's going to come out of that process, so well-formed 300ppi raster images would be hard to tell from vector in most cases. But best to use a vector format (which it probably is in the image source file anyway) for best results.

Robert at ID-Tasker

Legend

@James Gifford—NitroPress

I would disagree - 300ppi bitmap version of the original vector will look much worse when printed.

James Gifford—NitroPress

Legend

Since nearly all ID projects are exported one way or the other, usually to PDF for print, and the export process is usually set to optimize graphics for a particular end result... no. Having an effective PPI higher than 300 is usually a good or at least benign thing.

If you're working with really large images placed really small, so that you end up with huge effective PPI (1000 or more)... it's still good, but it may be worth reducing the largest ones to save file space, processing power and generally take a load off the export process. But 300-400 effective PPI is still your goal.

(Unless you're exporting to 600 PPI for some reason — in which case you want at least that in your effective values. But 300ppi is the working standard for nearly everything including high-res process printing.)

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