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Reduce PDF file size : free Acrobat replacement for Leopard

348484 Views 226 Replies Latest reply: Apr 16, 2013 9:40 AM by Jerome Colas RSS
  • Christina Rodriguez Level 4 Level 4 (1,360 points)

    And can you upload one of your images?

  • BDAqua Level 10 Level 10 (114,685 points)

    Really nice work Christina, thanks!

  • BDAqua Level 10 Level 10 (114,685 points)
    I see on my screen at 72 dpi are readable and certainly they seem readable enough to put ten of them together into a ten page pdf and to then mail to someone.

    Yes, those should look fine on a screen, but when say Printing to a 720DPI printer, it'll only have one dot to try to make 10 horizontal by 10 vertical dots, with fancy programming it can compare other near pixels to figure out how to best fill in the missing ones, but it still boils down to making 100 dots out of one dot when printing.


    Also, one way JPEG reduces file sizes is by cutting out colors, say you have 10 shades/levels of each Red, Blue, & Green, save 50% quality jpg will leave you with 5 shades/levels of each. (roughly speaking, it could depending on percentage of each shade cut out far more).

  • hotwheels 22 Level 1 Level 1 (0 points)

    Hi Christina.


    Thanks again.


    I have an old version of photoshop on my windows machine. I have Aperture and Adobe Elements 3 (from a disk that came with my leica digital).


    I'm slowly making my way to CS4 (I think or CS5?) so that I can get InDesign for posters. My understanding is that this will come with Photoshop and Illustrator but that it won't come with Acrobat? I could use some kind of 3D functionality but I'm not sure if I have a use for Acrobat short or long term or not...I'm slowly moving to the InDesign, Photoshop Illustrator suite at least but it is 1200 bucks.


    Anyway, I seem to be managing pretty well with the 150 dpi filter and just saving out as a new filename and checking but I am only doing any of these that are over 100 MB. Next I tackle 50 - 100 MB when I get the time but that trashing of the images still has me a bit worried. It would be good to know if this was due to the Filter or due to Preview and whether saving out from Preview is the thing that will corrupt the document (as opposed to the filter having done this). I haven't had time to check but it would be good to know. Trashing docs is a bad thing.


    Cheers and thanks,



  • hotwheels 22 Level 1 Level 1 (0 points)

    Hi Christina.


    I think you are asking for my image? Anyway, here is one that is 17.2 GB. I think it is actually (or could be) black and white or greyscale if I wanted but with your help I am realizing these images are huge for my needs. I just picked 300 dpi (now it's 200 dpi).



    But again it seems like total madness to be printing these out (the 300 dpi ones) so that I have 500 MB sized documents that I then downsize to 500 KB by SIMPLY SELECTING selecting 150 dpi.


    I mean, on its face it doesn't make any sense to me to have images scanned at 300 dpi - printed to pdf - and then filtering this pdf to 150 dpi reduces by this kind of multiple. Anyway...



  • hotwheels 22 Level 1 Level 1 (0 points)

    Hi Christina, BD.


    Can you guys take a look at these two files?


    I simply opened the first in Preview and saved out with the 150 dpi AVERAGE compression filter. Then I opened it immediately in Adobe Reader 9.4.5...

  f 150%20dpi%20test.pdf


    - Jon

  • BDAqua Level 10 Level 10 (114,685 points)

    On that scanned Tiff, it's 300*300 dpi, LZW compression so about have the size of the full uncompressed one.


    It's also 16.7Million colors (32 bit), which I think is wasting a lot of space for what appears to be a Greyscale image, & 300 dpi appears to be higher rez than the source of the scan.


    I converted it to 8 bit Grayscale & file length went from 16.4MB to 7.4MB as an LZW TIFF. Scaling it to 67% dropped it to 3.2MB without too much loss of detail.

  • Christina Rodriguez Level 4 Level 4 (1,360 points)

    Simply saving the same image as a pdf with jpeg compression brings the file size down to 6.8MB. If you make the DPI 150, you are looking at about 3.2 MB...


    BTW you can do this with any version of Photoshop (I have Photoshop CS), and in Photoshop you can set up an Action which you can then batch process directly in Photoshop...

  • hotwheels 22 Level 1 Level 1 (0 points)

    Hi Christina, BD.


    Thanks. The word on the CMYK issue is that this is a bug in Preview and that it will trash your images (turn them green) for any file size reduction routine run in Preview (including these filters). Seems like a bad bug.


    OK, on the other stuff. Thank you.


    I need to get CS5 or CS4 here one of these days. What I really need is InDesign but I guess Photoshop and Illustrator come along with it? Does anyone know if I am correct in thinking that it does /not/ include Acrobat X? I mean, 1200 clams for CS whatever and then another 400 or something to add in Acrobat X?


    Not sure if this is totally OT but does anyone know what Acrobat does for me these days (also can it deal with 3D models?!) and does anyone know if it does not come with CS5? Seems like a ton of cash to shell out but if there is a significant add to my workflow I'll get it. Anyone know if there are good tools to interface with Aperture?!


    Thanks a ton for getting this straight for me.


    - Jon

  • hotwheels 22 Level 1 Level 1 (0 points)

    hi BDAqua,


    Thank you. I really need to set down and walk myself through all of this.


    I can see your steps here and they are very helpful in thinking this through. I guess what happens over here is that I have a ton of scanning that I do and I just set the scanner and then don't think about it. Since I run color scans it is hard to drop to only black and white but I have dropped it to 200 dpi.


    That said, 3.2 MB still seems to me to be a very large file when I have pdfs that include 20+ images such as this and these pdf's are under 1 MB and totally readable. No? I mean, the problem for me here is that I would need to go through all of my scans manually after scanning them since doing the settings on each scan one by one will take way too much time.


    And even if I do this manually on each and every image that I want to put into a pdf, this is a ton of time and still my pdfs will be too large to email from what I can tell. The Default downsample reduction routine in Preview appears to downsample to a point of unreadability from the thread I have read. And now there is an additional bug of Preview trashing CMYK images in a pdf document any time you downsize.


    I don't mean to list all the problems but the automated reduction routine for printing to pdf (I think you mentioned this on another thread) is very convenient. Is it possible that scanning to jpg and print-screening to jpg will allow me to print pdf's to a manageable size and/or have images that don't need manual downsizing?


    Or is the solution to simply drop to 200 dpi with 8 bit color and convert to greyscale whenever possible?


    Am I correct in thinking that these should also let me /print/ to pdf at 150 dpi AVERAGE compression, so that I don't have to downsample later? Or is there another utility that will let me do this? I think I read somewhere that this can be done in preview but it looked like it was five or six steps to do it...




    - Jon

  • BDAqua Level 10 Level 10 (114,685 points)
    and these pdf's are under 1 MB and totally readable. No?

    Readable on screen, or really nice looking when printed?


    I mean, the problem for me here is that I would need to go through all of my scans manually after scanning them since doing the settings on each scan one by one will take way too much time.

    Hmmm, not sure what scanner or SW you're using, but it's quick & easy here using VueScan...



    Or is the solution to simply drop to 200 dpi with 8 bit color and convert to greyscale whenever possible?

    Yes, but with Vuescan it's simple to adjust any of that for each scan.

  • hotwheels 22 Level 1 Level 1 (0 points)

    Hi Kurt.


    OK. I think I have enough info to get this moving. That pdf corruption for CMYK docs really had me concerned but I imagine I don't have a lot of these. That said, it will be good to know. I can see getting bit very hard by this. For instance, someone on an earlier post here said the filters helped them submit a grant application. It would be a real bummer if this was a CMYK doc and they only checked that the file was able to get out via email and not that it didn't get trashed...


    I think what I meant on the conversion is that I now have my scan settings set to 200 dpi. I'm not sure if I can control the 32, 16 or 8 bit but I can check. Anyway, I may do 10 - 20 document scans at a time and if these are at too high a resolution then I have to convert all of them manually down to something else and then I have to print to pdf. Big pain. It would be much easier to ask the pdf printer to dumb them down so that I can retain the original images at their original sizes and/or not have to convert, print to pdf, delete the conversions etc, etc.


    Anyway, I DO have to drop a ton of my images down from 10 MB TIFF as this seems way too large for my needs for this. Am I correct in thinking that Vuescan won't do this in bulk?? If so, is there a utility that I can use that would let me downsize all my scans that are too large for my needs? Say in conjunction with finding them in Finder or with Whatsize? It seems like a terrible waste of space to have so many 10 MB scans when they will never be printed and all I need is a representation at 8 1/2 x 11 that can be read in print or on the screen...



  • BDAqua Level 10 Level 10 (114,685 points)

    GraphicConverter has a powerful Batch convert option...



  • hotwheels 22 Level 1 Level 1 (0 points)

    thank you so much.


    you got me back to my hacking through the brush over here...


    thanks and goodwill

  • alangenh Calculating status...

    This is great, thank you so much!

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