How to examine pdf for image file formats, OCR, and layers

Hi,
I have a question about how to find out specific features of a pdf. I am using Adobe Acrobat 9 Pro for windows.
With any given PDF, I am looking to find out:
a] The specs of any image files used to create the pdf (i.e., if the pdf is made up of text pages with image objects on top of them, are those image objects JPGs? TIFFS? What resolution are they? Are they compressed?)
b] Does this PDF have OCR already embedded in it?
c] Does this PDF have multiple layers?
with a] -- file format is perhaps the most important, resolution and compression being second most
with c] -- is there an easy way to see the layers, visually, on the page images?
What is a smiple way to find out this information?
I've poked around a bit in the "Examine Document" function, and various checks in "Preflight," as well as the help manual, and have found bits and pieces that look like some of what I'm looking for, but nothing simple or conclusive yet.
Any help or advice would be wonderful! I just want a simple way to be able to see what my PDF is made out of, in terms of image files, OCR, and layers.
Thanks,
Andrew

Preflight is inded the best way to do this operation. You may have to read a bit to figure out what you are looking at, but that is the right route to take.

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We receive images from several vendors in order to build our catalogs in Adobe InDesign CS2, and then we export print pdfs from InDesign. We want to standardize our requirements for receiving images from vendors, and we had a question related to file formats. Is it okay to use jpeg files as long as they are in high-resolution CMYK format?
It is a part of our work flow to accept the images untouched from the vendor, no re naming of files, or changing f file formats. I understand that the safest bet is for EPS and TIFF formatted images, but will JPEG files be problematic in any way? Someone told me that because of their compressed format that some info could get lost when embedding into pdfs. Is there a book, or any printed documentation about what types of image file formats to use to create pdfs?
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Elliott

(1) There is nothing "unsafe" about JPEG-compressed images. However, JPEG compression is
lossy and depending upon the type of image, its resolution, and the compression settings used when creating the JPEG file, the results at the end of the workflow may not be satisfactory. That having been said, if JPEG compression is used for a photographic image (not a screen shot or an image representation of what should be a vector diagram), the "maximum quality" setting is used in producing the JPEG image (
not maximum compression), and the image is of appropriate resolution for its final purpose (at least 150 dpi, preferably closer to 300 dpi for printing) at full magnification, then there is nothing "unsafe" about JPEG.
(2) You should be aware that saving images in EPS (Encapsulated PostScript) format from Photoshop may yield JPEG compression, depending upon options chosen. Thus, there is nothing inherently "safer" about EPS compared to JPEG. And ironically, you can also get JPEG compression in TIFF files if you aren't careful how you save them, although that is very uncommon.
(3) CMYK is not necessary for image placement into InDesign as long as the image is tagged with the appropriate ICC color profile (such as sRGB, Adobe RGB, etc.). InDesign can convert those RGB images to whatever the final print conditions are or, if creating PDF, leave the images in RGB format with the ICC profile. How you create the output obviously depends heavily on what type of workflow your print service provider has. More "up to date" printers support color-managed workflows with ICC color profile tagged images in PDF files.
(4) In terms of receiving images from vendors, if you require them to convert the images from whatever their native RGB color space is to CMYK, you really must specify
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*** Marker: SOI (xFFD8) ***
OFFSET: 0x00000000
*** Marker: APP0 (xFFE0) ***
OFFSET: 0x00000002
length     = 16
identifier = [JFIF]
version    = [1.2]
density    = 72 x 72 DPI (dots per inch)
thumbnail = 0 x 0
B) an *.jpg file produced with Adobe Illustrator > File > Save For Web > JPEG > ICC profile embedded:
*** Marker: SOI (xFFD8) ***
OFFSET: 0x00000000
*** Marker: APP0 (xFFE0) ***
OFFSET: 0x00000002
length     = 16
identifier = [JFIF]
version    = [1.2]
density    = 100 x 100 (aspect ratio)
thumbnail = 0 x 0
C) an *.jpg file produced with Adobe Photoshop > File > Save As > JPEG > ICC Profile embedded
*** Marker: SOI (xFFD8) ***
OFFSET: 0x00000000
*** Marker: APP1 (xFFE1) ***
OFFSET: 0x00000002
length          = 1320
Identifier      = [Exif]
Identifier TIFF = 0x[4D4D002A 00000008]
Endian          = Motorola (big)
TAG Mark x002A = 0x002A
EXIF IFD0 @ Absolute 0x00000014
Dir Length = 0x0007
[Orientation ] = Row 0: top, Col 0: left
[XResolution ] = 720000/10000
[YResolution ] = 720000/10000
[ResolutionUnit ] = Inch
[Software ] = "Adobe Photoshop CC 2014 (Windows)"
[DateTime ] = "2014:08:02 17:21:15"
[ExifOffset ] = @ 0x00A8
Offset to Next IFD = 0x000000D4
EXIF IFD1 @ Absolute 0x000000E0
Dir Length = 0x0006
[Compression ] = JPEG
[XResolution ] = 72/1
[YResolution ] = 72/1
[ResolutionUnit ] = Inch
[JpegIFOffset ] = @ +0x0132 = @ 0x013E
[JpegIFByteCount ] = 1006
Offset to Next IFD = 0x00000000
EXIF SubIFD @ Absolute 0x000000B4
Dir Length = 0x0003
[ColorSpace ] = sRGB
[ExifImageWidth ] = 200
[ExifImageHeight ] = 200
Regards,
Pawel Kuc

This is a user-to-user forum and is not monitored by Apple for feedback purposes. You can give feedback to Apple here: Apple - Mac OS X - Feedback

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Hi.. i am not getting error, But i am not getting the original contents from my file. i am getting all ASCII vales, instead of my original data. here i am including my code.
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import java.io.IOException;
import java.sql.*;
import java.io.*;
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OP
PDF-1.4 %âãÏÓ 2 0 obj <>stream x+är á26S°00SIá2PÐ5´1ôÝ BÒ¸4Ü2KüsSSS4C²ê Pkø$VãGÒU×713CkW )(Ü endstream endobj 4 0 obj <>>>/MediaBox[0 0 595 842]>> endobj 1 0 obj <> endobj 3 0 obj <> endobj 5 0 obj <> endobj 6 0 obj <> endobj xref 0 7 0000000000 65535 f 0000000325 00000 n 0000000015 00000 n 0000000413 00000 n 0000000168 00000 n 0000000464 00000 n 0000000509 00000 n trailer <<01b2fa8b70ac262bfa939cc786f8770c>]/Root 5 0 R/Size 7/Info 6 0 R>> startxref 641 %%EOF
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How to examine pdf for image file formats, OCR, and layers

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