Create PDF without image compression?

[genoism]

How do i create a pdf from multiple images without any compression?

Seems like even if i do optimize pdf and select png(edit the settings to do max res and no downscaling), when it saves the pdf, at 100% zoom, it's obviously bigger than my original png and compressed(or maybe it looks blurry because it's being upscaled when i never requested).

In short, if my png is 500x500, i want it to be exactly that size at 100% maginification once the pdf is saved out. I don't want any compression, i don't want any scaling...why is it so hard to do this???

Any help is much appreciated!

[Dave Merchant]

PDF files use physical page dimensions (Points, 1/72 inch). They will not scale to a 1:1 pixel size as pixels mean nothing in the physical world.

The ISO PDF standard defines which types of encoding are permitted for color bitmap image data - JPEG and JPEG2000. Any other type must be converted.

[Test Screen Name · Accepted solution]

However... the conversion can be lossless.  If you make a PDF file from a SINGLE image (different option) and select the image format in Files of Type you can click Settings and choose the format for compression. Choose ZIP and compression equivalent to PNG is used.

You also have fine control when printing to PDF.

It's just the Combine Files function, which is fast and simple, that lacks choices.

[rob-datarati]

This answer is for Acrobat DC (Creative Cloud 2015).

Simply go to the Preferences > Convert to PDF > PNG (or JPEG) and then Edit Settings. Change compression ot JPEG Maximum.

[Test Screen Name]

Choosing JPEG maximum should mean there is no visible effect. However JPEG will ALWAYS compress in a lossy way so this is not strictly speaking an answer to "How do i create a pdf ... without any compression?" only "How do I create a PDF... without losing visible quality".

[LBreaux]

Thanks Rob!

This issue has been driving me NUTs but your solution (Though very hard to find haha) has done the trick.

Much appreciated!!

[obiimobi]

Thanks Rob!