why this scan from acrobat is so heavy

[pierret18811376]

Hello,

I have made a scan with Acrobat Pro : Why a 4 text pages from 135 x 215 mm book gives me a scan file of 11.7 Mo (is it a bug ?) :

Here are my scan settings in Acrobat Pro :

1) No compression

2) Max quality output :

[Test Screen Name]

Why do you turn off adaptive compression?

[pierret18811376]

I turn off adaptative compression, because the result is not good (no natural).

[gary_sc]

Hi Pierre,

Looking at the resulting page in the thumbnails, it looks like you did not set a white point for the page's background. That means that the page that is not text is gray. That "content" is part of what's probably part of that page bloat.

Try this: First make a copy of the document. In the copy, go into Edit mode and click on the background (anything that isn't text), and press the Delete key. If successful, the background will go from somewhat gray to white. Do this for all pages, save, and close. 

Now look at the storage size compared to the original. It should be smaller.

For more information on getting a good scan in the first place, please see this blog I wrote for Adobe a long time ago. The one big difference between then and now is that more modern "office" scanners provide no controls for getting a quality scan. Rather, the manufacturer and reduced it down to "push a button for documents," or "push a button for images." 

http://photosbycoyne.com/Gary's_Help/Scanning/clean-scanning.html

[pierret18811376]

Your blog has been very useful for me.

[pierret18811376]

I have noticed perhaps a bug : 

As you can see I had unchecked the compression (this compression was on "JPEG / CCIT 4").

Then I have press the button "default" (so the compression was now with "JPEG2000 / JBIG 2 with loss") and made a scan with the compression.

Then I have unchecked the compression (setting always on "JPEG2000 / JBIG 2 with loss"), and make a new scan.

Result : the problem has gone : the file size is normal.