Monochrome bitmap bicubic downsampling for PDF

Whilst saving out a PDF for print using the default high quality print setting, under - compression - monochrome bitmap image - bicubic downsampling setting, is set at 1200. This produces a large file size and if you reduce this number to 300 the PDF size is much smaller. I can't see any reduced quality and I don't actually have any monochrome bitmap images in my document but I don't actually know what this setting is doing. Could some one explain what it is and if reducing the resolution is going to reduce the quality in some way?
Thanks for the help.

Rob Day wrote:
Something about your test looks off. The export from ID and export from PS PDFs are both zoomed at 1200%, but the export from ID vrsion is 90% smaller.
Yeah I noticed that I actually had the image in InDesign scaled @ 90%, so the effective ppi was around 650. I get the same jagged results when I use anything other than a 300 or 600 effective ppi. Whereas if I use a 650ppi image in Photoshop and export to PDF, it downsamples smoothly.
Rob Day wrote:
The diagonal lines in your test are 1 pixel so at 300ppi to an offset press at 150lpi, the lines would be less than a halftone dot so I'm pretty sure you would need a loupe to see any difference. Maybe with a stochastic screen there would be better resolution but still difficult to see. So if the printing is that good I would just export without down sampling. With disk space running at 15 cents a gigabyte there's not much to gain with a downsample.
It becomes noticeable with some images more than others, but I'm printing a lot of images of buildings and drawings with sharp lines that converge to a point, or are distinguishable in the full size image but indistinguishable when downsampled. This can introduce distracting patterns when they aren't downsampled smoothly, something like this:
Unfortunately the printers near me aren't very good, so I'm having things printed online, and this particular printer (blurb.com - for a small job) won't accept large PDFs without compressed/downsampled images :/ I'm making 300dpi versions of the really crucial images for the time being, but I'm hoping there is a better solution!
The other issue is exporting the PDF for use on the web, either as a download or on an online PDF viewer like issuu.com. The two PDFs on the right side of my test look much better in these situations. Is there any disadvantage to using Distiller to make my PDFs for this purpose using the Device Independent setting? I don't have any special interactive elements.

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Image Downsampling Settings for PDFs

Hello. I am experimenting with the PDF settings in Acrobat to try to find a good compromise between image quality and file size. I am trying to learn about bicubic downsampling for images and what would be good settings to use. One thing that I've noticed in the different default PDF settings provided by Adobe (High Quality Print, Press Quality, Standard, Smallest File Size, etc.) is that the pixels per inch threshold for downsampling images is always 1.5 times greater than the downsampled image. For example, the Standard setting downsamples images above 225 ppi to 150 ppi, and the High Quality Print setting downsamples images above 450 ppi to is 300 ppi. Could someone explain the reason for using this ratio? Also, why not just have one value for downsampling? For example, for the Standard setting, why not just downsample all images above 150 ppi to 150 ppi?
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Mark,
To get the highest possible quality jpeg you need to export with the preset "Jpeg - original size" with its default settings. Check, how they are set:
Size to: This lets you specify the dimensions of your image files in various ways.
Original size, percent of original size, fit within all refer to the dimensions of the digital image measured in pixels, and that is directly related to the resolution of the the image. You will want to preserve as many pixels per row and column as the original image has, so set this to original size.
cm, inches refers to the width and height of the printed or displayed version of your image. It will only make sense, if you specify dpi as well. Then the pixel size of your exported images will be computed from the dpi (dots per inch) you set and the dimensions in inches. I prefer "Original size", unless I know I want to print an images with 4 by 6 inches e.g., then I use this setting and set the dpi to 300.
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Hello,
i am trying to describe a problem which persists since version CS3 of InDesign. It's about aliased edges in images in a certain angle; occuring when exporting the brochure as PDF file (at 300 ppi). The placed images are always at a higher quality than needed (for example 780 ppi effective). The aliasing is not there when opening the original image files in photoshop (viewing at 100%).
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- Crop Image data to frames
- Marks: Crop Marks and Page Information
- Output: No Color Conversion
- Advanced: Transparency Flattener: High Resolution
- Compatibility: Acrobat 4 (PDF 1.3)
- PDF /X-3:2002
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- The right one is the result when exporting a InDesign Document with the same width to a PDF with the mentioned settings
Downsampled in Photoshop CS6 to 216 mm width
Exported from InDesign CS6 with mentioned settings
I have no clue what happens here, but it looks like the internal downsampling of InDesign CS6 is not very good.
When i write a PostScript file of the brochure and put it in Distiller (with the same PDF Preset as above), the image looks like the one made with Photoshop. So this problem has to lie somwhere deep in InDesign or it's settings.
Anybody with similar experiences?

Rob Day wrote:
Something about your test looks off. The export from ID and export from PS PDFs are both zoomed at 1200%, but the export from ID vrsion is 90% smaller.
Yeah I noticed that I actually had the image in InDesign scaled @ 90%, so the effective ppi was around 650. I get the same jagged results when I use anything other than a 300 or 600 effective ppi. Whereas if I use a 650ppi image in Photoshop and export to PDF, it downsamples smoothly.
Rob Day wrote:
The diagonal lines in your test are 1 pixel so at 300ppi to an offset press at 150lpi, the lines would be less than a halftone dot so I'm pretty sure you would need a loupe to see any difference. Maybe with a stochastic screen there would be better resolution but still difficult to see. So if the printing is that good I would just export without down sampling. With disk space running at 15 cents a gigabyte there's not much to gain with a downsample.
It becomes noticeable with some images more than others, but I'm printing a lot of images of buildings and drawings with sharp lines that converge to a point, or are distinguishable in the full size image but indistinguishable when downsampled. This can introduce distracting patterns when they aren't downsampled smoothly, something like this:
Unfortunately the printers near me aren't very good, so I'm having things printed online, and this particular printer (blurb.com - for a small job) won't accept large PDFs without compressed/downsampled images :/ I'm making 300dpi versions of the really crucial images for the time being, but I'm hoping there is a better solution!
The other issue is exporting the PDF for use on the web, either as a download or on an online PDF viewer like issuu.com. The two PDFs on the right side of my test look much better in these situations. Is there any disadvantage to using Distiller to make my PDFs for this purpose using the Device Independent setting? I don't have any special interactive elements.

ECL Viewer Redlining does not work in cFolders for PDF

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<PDF>Adobe Acrobat (*.pdf)</PDF>
<SAP_WFE>SAP cProject Suite start file (*.sap_wfe)</SAP_WFE>
<PGP>PGP encrypted file (*.pgp)</PGP>
<JT>EAI DirectModel (*.jt)</JT>
<VRL>VRML (*.vrl)</VRL>
<WRL>VRML (*.wrl)</WRL>
<STL>Stereolithography (*.stl)</STL>
<PS>PostScript I, II (*.ps)</PS>
<EPS>Encapsulated PostScript (*.eps)</EPS>
<DGN>Microstation (*.dgn)</DGN>
<PCX>PC Paint (*.pcx)</PCX>
<PICT>Macintosh Paint (*.pct)</PICT>
<PCT>Macintosh Paint (*.pct)</PCT>
<RAS>Sun Raster (*.ras)</RAS>
<GIF>Graphic Interchange Format CompuServe (*.gif)</GIF>
<C4>EDMICS C4 (*.c4)</C4>
<PNG>Portable Network Graphics (*.png)</PNG>
<JPG>JFIF Compliant (*.jpg)</JPG>
<JPEG>JFIF Compliant (*.jpg)</JPEG>
<BMP>Windows Bitmap (*.bmp)</BMP>
<TIF>Tagged Image File Format (*.tif)</TIF>
<TIFF>Tagged Image File Format (*.tif)</TIFF>
<MLR>CALS MIL-R I,II (*.mlr)</MLR>
<MIL>CALS MIL-R I,II (*.mi)</MIL>
<_907>Calcomp (*.907)</_907>
<_906>Calcomp (*.906)</_906>
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<MI>HP ME 10/30 (*.mi)</MI>
<HPG>HPGL/HPGL-2 (*.hpg)</HPG>
<HPGL>HPGL/HPGL-2 (*.hpgl)</HPGL>
<IGS>IGES (*.igs)</IGS>
<CGM>Computer Graphic Metafile (*.cgm)</CGM>
<DWF>AutoCAD (*.dwf)</DWF>
<DXF>AutoCAD DXF R11-14 (*.dxf)</DXF>
<DWG>AutoCAD DWG 2.5-14 (*.dwg)</DWG>
<MDL>(*.mdl)</MDL>
<MPC>(*.mpc)</MPC>
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<SAP_WFE>application/sap_wfe</SAP_WFE>
<PGP>application/x-pgp</PGP>
<JT>application/x-jt</JT>
<VRL>model/vrml</VRL>
<WRL>model/vrml</WRL>
<STL>application/stl</STL>
<PS>application/postscript</PS>
<EPS>application/postscript</EPS>
<DGN>model/vnd.dgn</DGN>
<PCX>image/pcx</PCX>
<PICT>image/pict</PICT>
<PCT>image/pct</PCT>
<RAS>image/ras</RAS>
<GIF>image/gif</GIF>
<C4>image/c4</C4>
<PNG>image/png</PNG>
<JPG>image/jpeg</JPG>
<JPEG>image/jpeg</JPEG>
<BMP>image/bmp</BMP>
<TIF>image/tiff</TIF>
<TIFF>image/tiff</TIFF>
<MLR>image/mlr</MLR>
<MIL>image/mi</MIL>
<_907>image/907</_907>
<_906>image/906</_906>
<cals>image/cals-1840</cals>
<MI>image/mi</MI>
<HPG>image/hpgl</HPG>
<HPGL>image/hpgl</HPGL>
<IGS>application/iges</IGS>
<CGM>image/cgm</CGM>
<DWF>model/vnd.dwf</DWF>
<DXF>image/vnd.dxf</DXF>
<DWG>image/vnd.dwg</DWG>
<MDL>image/mdl</MDL>
<MPC>image/mpc</MPC>
</Mimetype>
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<SAP_WFE>0</SAP_WFE>
<PGP>0</PGP>
<JT>3</JT>
<VRL>3</VRL>
<WRL>3</WRL>
<STL>3</STL>
<PS>2</PS>
<EPS>2</EPS>
<DGN>2</DGN>
<PCX>2</PCX>
<PICT>2</PICT>
<PCT>2</PCT>
<RAS>2</RAS>
<GIF>2</GIF>
<C4>2</C4>
<PNG>2</PNG>
<JPG>2</JPG>
<JPEG>2</JPEG>
<BMP>2</BMP>
<TIF>2</TIF>
<TIFF>2</TIFF>
<MLR>2</MLR>
<MIL>2</MIL>
<_907>2</_907>
<_906>2</_906>
<cals>2</cals>
<MI>2</MI>
<HPG>2</HPG>
<HPGL>2</HPGL>
<IGS>2</IGS>
<CGM>2</CGM>
<DWF>2</DWF>
<DXF>2</DXF>
<DWG>2</DWG>
<MDL>2</MDL>
<MPC>2</MPC>
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please upload this to your WebDAV (replace the old one and save this under a different name as
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Monochrome bitmap bicubic downsampling for PDF

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