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Solved: Wierd Thing With Jpegs

Discussion in 'Digital Photography & Imaging' started by Guyzer, Jun 16, 2007.

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  1. Noyb

    Noyb Trusted Advisor

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    Yes .. One at a time for the Email Address I gave you ... for sure
    They say I have a 1 gig email box ... never tried it.
     
  2. Guyzer

    Guyzer Thread Starter

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    Well we're trying it now cuz I sent you one.
     
  3. Noyb

    Noyb Trusted Advisor

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  4. Noyb

    Noyb Trusted Advisor

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  5. Guyzer

    Guyzer Thread Starter

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    That's made a difference. What did you do?
     
  6. Noyb

    Noyb Trusted Advisor

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    Normally … The ppi of the image is meaningless … (boy will this start an argument here) …
    But I thought an image default ppi of 32768 was a bit ridiculous and maybe confusing Vista.

    Without re-sampling the image … (changing it in any way) …
    I change the default physical size to 10 inches wide … resulting in a default ppi of 308…
    Which is more normal … As normal goes.

    I used Photoshop (could’ve used Irfanview) ... Can you do this ppi “resizing” in Canon ???

    Notice the picture size 3048x2052 (resolution) stayed the same after resizing.
    See if you can do this.

    Redoak would sure love your pics.
    Got to take the wife out for a double date lunch .. be back in a couple hours.

    Before – After resizing default image size … ppi only
     

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  7. Guyzer

    Guyzer Thread Starter

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    Doesn't make sense when all the rest of my pics are not affected. If Vista is confused it's because of another reason and only on those few.
    10" wide is not normal in my house because I have quite a few printed at 18 x 12 and I would rather downsize than up when the time comes. Let me explain my usual procedure. I shoot all my pics as RAW. Then I download to my computer and with PSP XI I convert them to TIFF. From the Tiff file I make whatever adjustments I want and save the pic. If I decide to have something printed I change the size to 18 x 12 and save as a Jpeg because that's the format accepted by the photo printing co. that I use.
    As stated I use PSP XI and it will do it if need be... however.... I don't think there is a need because not every pic is troubled. If they were then there would be a need.
    The file size got smaller so something changed. Keep in mind I don't want to save anything less than 18 x 12
    Don't tell him about them cuz I would rather post them myself if I so decided. :D
     
  8. lister

    lister

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    What Notb is saying is that so far in the 21st Century, a PPI of 32768 is 'a bit high'; as an inch of print would take a 1073,741,824 pixel image - over a thousand megapixels.
     
  9. Guyzer

    Guyzer Thread Starter

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    I'm aware of that but lets keep in mind why I started this thread. I have approx. 6 pictures out of hundreds that are affected so what he mentions won't be the cause of my problem. He may have solved my problem but what I want to know is why just those few and not the others? Makes sense to me.
     
  10. Noyb

    Noyb Trusted Advisor

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    What's the dpi of the 6 bad pics ... As compared to the good ones ???

    I have a hunch it's how you're using Canon software ....
    and a Vista problem with large dpi's
    That's all that's making sense at this point.

    The only numbers that are important at this point is the overall Pixel size ...i.e.... 3048x2052... (whatever)
    Your printer/display routines will take care of the physical resizing for display/printing purposes ...
    and one would think .. thumbnails
     
  11. Noyb

    Noyb Trusted Advisor

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    jpeg are compressed files ... every time you open a jpeg and re-save/re-compress ... the file size will change.
    A compression of a compression is like a rumor ... So disregard the file sizes of jpegs as an exact number.

    Forget inches ... You can only print the best you got ... i.e... the overall pixel size.
    The printer/display routines will decide the physical size when you tell it what you want.
    Then the computer will determine the dpi to print/display to your physical requirements.
    It doesn't matter what the image thinks it's default ppi (physical size) is.

    Your 3048 pixel wide pictures will print at 18 inches wide ... with a print dpi (resolution) of 170
    That’s good but kinda marginal.

    Boy ... This should stirr up another ppi/dpi argument :)

    If you want ... Email me a bad tif ... they're uncompressed formats.
    We can work on them ... without them becoming rumors.

    I'm still thinking the Vista Thumb problem is the large default ppi number in the image(s)... that is really meaningless.
     
  12. Noyb

    Noyb Trusted Advisor

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    After all that Babble ... I've determined your problem is probably Paint Shop Pro.
    I reinstalled my Vista ... and duplicated your problem with your original picture.
    It displays OK .. but the thumb is distorted.
    In a way, this is good news :) ... your Vista is OK (or at least normal :mad:)

    Fixing your original .. then re-creating a similar sized image ... I could not duplicate the problem using Photoshop CS2.

    The problem should be in the first two EXIF numbers below.
    I'd suggest to try re-saving using more a normal PPI number ... like 300 ... and see if that works.

    Can any Paint Shop users jump in here ??? ... I'm not familiar with its resizing routine.
     

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  13. Guyzer

    Guyzer Thread Starter

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    Ok I have solved my problem. When I went to " save as " I decided to try running PSP's Wizard from within the optimizer selection. The encoding was set to " standard " as it aways has been and I changed the compression value to 1 instead of 6 which was the pre-set. In the end it did make a slight change to the actual file size, a few more kb's actually but everything else stayed the same. The thumbs now show as they are meant to. I have no explanation as to why that made a difference but it did. I'm going to root around PSP's preferences and see what if anything I can find there.
     
  14. Guyzer

    Guyzer Thread Starter

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    Noyb I just fired off the new saved file. See if you can figure out what changed.
     
  15. Noyb

    Noyb Trusted Advisor

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    The originals are the best you have.
    Not sure what editing your doing ... but I'd keep the original camera images ..
    and save to copies ....
    Just in case.

    Edit .. Will do when it arrives.
     
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