Inspiring

Answered

Blurry bitmapped images in PDF

Forum|Forum|3 years ago
April 3, 2022
7 replies
9517 views

I have created a multi-page document that is a combination of vector and raster images (photos). The photos are all high res (300 dpi) and look sharp in Illustrator, but when I create a PDF—even without compress and at default settings—the images are all soft.

Any idea what's going on? Ultimately, I want the images to be sharp and the file size to be much smaller, they're intended to be used in a projected presentation.

I really appreciate any advice anyone can give, I am needing to get this off to the client tomorrow.

Thank you.

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Correct answer craigl33303718

OK, first of all, thank you everyone for your ideas and help, I really appreciate it.

I just now tried one, last-ditch idea. I copied my live graphics into a new Illustrator file and made a pdf and … perfect.

All of the settings appear the same to me, so I don't know why that worked. So odd.

C

craigl33303718AuthorCorrect answer

Inspiring

OK, first of all, thank you everyone for your ideas and help, I really appreciate it.

I just now tried one, last-ditch idea. I copied my live graphics into a new Illustrator file and made a pdf and … perfect.

All of the settings appear the same to me, so I don't know why that worked. So odd.

Ton Frederiks

Community Expert

Good to hear you've got it working.

Ton Frederiks

Community Expert

There is also a setting in Acrobat Preferences > Page Display > Smooth Images, that makes quite a difference in the display of small details. You could try if that makes a difference.

C

craigl33303718Author

Inspiring

So, I just did a little test/work around and made JPEGs (300 dpi which seems like overkill) of all of the artboards and then placed them into a new Illustrator document and made a PDF (with default settings) and it looked a lot better so I'm still confused.

Monika Gause

Community Expert

Please can you tell us the effective resolution of your images in the initial layout?

Without having your actual AI file and the images this is getting impossible to solve.

C

craigl33303718Author

Inspiring

There are a lot of images and the all vary a bit, but I have tried to have most of them at 300 dpi.

Sorry, I know it is difficult working on this blind.

C

craigl33303718Author

Inspiring

When I export as a 300 dpi jpeg it looks pretty good (some jpeg artifacts, but not bad) so the images appear to be getting compressed when converting to a PDF.

Monika Gause

Community Expert

300 ppi is the effective resolution?

C

craigl33303718Author

Inspiring

It is probably high as they are mainly using it for a digital presentation, but they may also print it out for attendees so I am erring on that side.

Monika Gause

Community Expert

You can check the exact effective resolution in Illustrator. Please do so.

Ton Frederiks

Community Expert

What do you see when you duplicate the .ai file, rename the .ai extension into .pdf and open that in Acrobat (I assume that you are using Acrobat to view the PDF)?

C

craigl33303718Author

Inspiring

I got the exact same result when I duplicated and changed the extension.

Ton Frederiks

Community Expert

Your export settings shoulsd not change the resolution.

How do you view the PDF? Do you import it into an app that modifies it?

Brad @ Roaring Mouse

Community Expert

What are your exact PDF export settings? Are you using a particular preset?

(maybe show a screen grab)

C

craigl33303718Author

Inspiring

Here are my settings. Everything appears to be set to default and my file size is huge (980 mb).

Brad @ Roaring Mouse

Community Expert

A couple of things first:

One: If you are prepraring a PDF for others to use, but do not need to send them it in a form that they can reopen in Illustrator, UNCHECK Preserve Illustrator Editing Capabilities. Otherwise, you are including the full Illustrator file, ALONG WITH THE PDF side, which can make the file unncesessarily large, especially if your images are embedded.

Two: Your compression settings are probably, again, unncessarily high quality. When Do Not Downsample is checked, the image at it's full resolution is being inckuded. ZIP compression, although lossless, is not very effective on photographic images.

So, bnack to your actuall issue:

Have you tried using one of the other presets: for instance the "best" is PDF/X-4. or even High Quality Print. and see what the result is.

Since, you say they are using it for presentation, if by that you mean they are putting it up on a screen like a powerpoint presenation, the 300 dpi in either of those presents is more than enough.

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