Hermitian: You didn’t dig deep enough NBC. On Jul 1, 2013 I discovered that the Muscatine Journal PDF which can be downloaded from here:
What I have shown is how both JPEGS provided by Applewhite (the COLB and the LFBC), soon after they were released by the Whitehouse, were photographed or scanned and transferred to the AP office, most likely in DC who put the images on the wire.
The variations in color are also visible but where enhanced by my operation and shows similar lighting conditions for both images.
A simple workflow at the Muscatine Newspaper involved importing the JPEG into photoshop, and applying a color correction. The second image is merely a reflection of this process.
You do know that you can save in photoshop to PDF and still allow for subsequent editing by including the .psd file?
Preserve Photoshop Editing Capabilities
Preserves Photoshop data in the PDF, such as layers, alpha channels, and spot colors. Photoshop PDF documents with this option can be opened only in Photoshop CS2 and later.
Yes, private refers to the PDF keyword which indicates that the following data are not to be interpreted, they are embedded by a photoshop tag. When opening in photoshop, photoshop actually can parse these data and load all the layers etc.
I actually extracted the object in question (Obj 12 in the PDF) which resulted in a file 5,550,950 bytes long. I then ran it through deflate.py and obtained a 10,804,407 byte long object. Using GIMP I managed to extract the 1739×2071 object which is, as you found out as well, the JPEG. It appears you may also have found a layer used to remove the bluish hue.
Well done. Your jpeg of the AP image is 3,654,760 bytes, the other one is 10,977,123 bytes.
The AP1 document is of a lower quality than the AP JPEG but larger. Who knows what has been done to this poor image… The color gradient one, which I believe was used to remove the bluish hue is much larger because it contains so many more color and is more random.
The user imported the JPEG provided by AP, made changes and saved to PDF but accidentally selected to preserve editing capabilities, inflating the document to many times its size.
Hilarious… How much do you really know about Adobe Suite and how they work deep deep down?
I am asking because these are capabilities I found easily explained on the internet.
The Composite Image is interesting as it suggests that layers were introduced. At least two operations were done on the AP JPEG they imported. Cropping and color adjustments.
Using the Equalize command
The Equalize command redistributes the brightness values of the pixels in an image so that they more evenly represent the entire range of brightness levels. Equalize remaps pixel values in the composite image so that the brightest value represents white, the darkest value represents black, and intermediate values are evenly distributed throughout the grayscale.
You can use the Equalize command when a scanned image appears darker than the original and you want to balance the values to produce a lighter image. Using Equalize together with the Histogram panel lets you see before-and-after brightness comparisons.
Keep in mind that the Equalize command applies adjustments directly to the image layer and deletes image information. For nondestructive adjustments, use adjustment layers or edit in Adobe Camera Raw.
I bet you I know what happened
The user noticed the bluish hue and decided to remove it. The process created a layer which you managed to extract. So far I am not very impressed by your explanation but I appreciate your efforts to look at the embedded .PSD file that was left their by photoshop when the Muscatine user, probably accidentally, elected to save all the data that would allow one to open the file and continue editing, preserving relevant information
obj 9 0 Type: /Page Referencing: 4 0 R, 10 0 R, 12 0 R, 3 0 R, 11 0 R << /CropBox [0.0 0.0 626.04 745.56] /Parent 4 0 R /Contents 10 0 R /Rotate 0 /PieceInfo << /AdobePhotoshop << /Private 12 0 R /LastModified "(D:20110427090136-06'00')" >> >> /ArtBox [0.0 0.0 626.04 745.56] /MediaBox [0.0 0.0 626.04 745.56] /Thumb 3 0 R /Resources << /XObject << /Im0 11 0 R >> /ProcSet [/PDF/ImageC] >> /Type /Page /LastModified "(D:20110427090139-06'00')" >>
So now we go to Obj 12
obj 12 0 Type: Referencing: 13 0 R, 14 0 R << /UseTextOutlines false /ExportCrispy true /CompositeImage 13 0 R /SaveTransparency true /RoundTrip true /EmbedFonts true /ImageResources 14 0 R >>
Obj 13 the Composition Image which I discussed before
obj 13 0 Type: /XObject Referencing: 15 0 R Contains stream << /Subtype /Image /Length 5550950 /Filter /FlateDecode /Name /X /BitsPerComponent 8 /ColorSpace 15 0 R /Width 1739 /DecodeParms << /Columns 1739 /Predictor 2 /BitsPerComponent 8 /Colors 3 >> /Height 2071 /Type /XObject >>