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Getting lower disk size of rendered JPG files

gibrril_fa945a6ceegibrril_fa945a6cee Posts: 550
in The Commons

Hi!

I just noticed something weird: when I render a 3000 x 2600 pixels pic in Iray, the result is a JPG file of about 6MB (at 96 DPI). Now I can find high res pictures online of comparable dimensions (4000 x 2000 pixels) at 350 dpi and those are 1.5 MB in size... So... How can I convert my 6 MB Jpeg out of Daz Studio into a 1.5 MB picture without scaling it down in pixel size?

Thanks a lot,

Me

Comments

  • barbultbarbult Posts: 26,250

    Use an image editing application like Photoshop to resave a version with more JPEG compression (lower JPEG quality).

  • gibrril_fa945a6ceegibrril_fa945a6cee Posts: 550

    Thanks for the reply! Can that be done in batch? (I have a bunch of renders that can be compressed this way... :) )

    Thanks a lot,

    Me

  • nicsttnicstt Posts: 11,715

    photoshop and gimp, yes

     

  • gibrril_fa945a6ceegibrril_fa945a6cee Posts: 550

    Is there a tutorial on how to batch convert in gimp?

    Thanks a lot,

    Me

  • TaozTaoz Posts: 10,262

    IrfanView (free) can do batch conversion too, has a ton of options.

  • L'AdairL'Adair Posts: 9,479
    edited May 2018
    Taoz said:

    IrfanView (free) can do batch conversion too, has a ton of options.

    +1

    I usually save renders as PNGs, process them in Photoshop, and then save a copy to JPEG with the highest quality. I then open the image in Irfanview and save incrementally, setting the quality at 99, then 98, then 97 and so on, until the size of the image is just under 2MB, which is the size limit for the Galleries. Previously, if I uploaded an image with a file size over 2MB, the gallery software would resize the image, I assume to bring the file size under the 2MB limit. (I can remember a time when uploading an image larger than that would result in an error, much like trying to upload an image less than 400 by 400 pixels does now.)

    As for using the batch function, there are step by step instructions in my Map Transfer tutorial, an entire section devoted to Irfanview and Batch processing.

    You can find more information and download the utility from Irfanview.com.

    Post edited by L'Adair on
  • FishtalesFishtales Posts: 6,212

    @L'Adair

    Under the Output Format/Options you can set the file size at the bottom of the JPEG options window, no need to do it a bit at a time :)

  • gibrril_fa945a6ceegibrril_fa945a6cee Posts: 550

    Thanks all!!! I found a Gimp Plugin called Bimp who did it for me!

    Thanks a lot!

    Me

  • L'AdairL'Adair Posts: 9,479
    Fishtales said:

    @L'Adair

    Under the Output Format/Options you can set the file size at the bottom of the JPEG options window, no need to do it a bit at a time :)

    I tried that, but it doesn't work without the RIOT plugin, and that plugin hasn't been updated to 64-bit yet, so I don't have it installed.If you're using the 64-bit version of Irfanview with the 32-bit RIOT plugin without issue, I'll go ahead and install it. That would really make things faster, and easier.

  • Hurdy3DHurdy3D Posts: 1,073
    edited May 2018

    Use https://tinyjpg.com/ and make sure that you upload your JPG with 100% quality.

    Tinyjpg reduces the image size by 50 to 70% withouth   noticale visual impact and it‘s free!

    Works also for PNGs.

    Post edited by Hurdy3D on
  • FSMCDesignsFSMCDesigns Posts: 12,844
    gibrril_fa945a6cee said:

    Hi!

    I just noticed something weird: when I render a 3000 x 2600 pixels pic in Iray, the result is a JPG file of about 6MB (at 96 DPI). Now I can find high res pictures online of comparable dimensions (4000 x 2000 pixels) at 350 dpi and those are 1.5 MB in size... So... How can I convert my 6 MB Jpeg out of Daz Studio into a 1.5 MB picture without scaling it down in pixel size?

    Thanks a lot,

    Me

    Is there a reason you save renders in .Jpg format? I have noticed that when saving as a .Jpg from DS, that the image has artifacts and is poor quality as opposed to saving in a lossless format such as .Png that I can convert later with a better tool such as in photoshop.

  • WahilWahil Posts: 308
    gibrril_fa945a6cee said:

    Hi!

    I just noticed something weird: when I render a 3000 x 2600 pixels pic in Iray, the result is a JPG file of about 6MB (at 96 DPI). Now I can find high res pictures online of comparable dimensions (4000 x 2000 pixels) at 350 dpi and those are 1.5 MB in size... So... How can I convert my 6 MB Jpeg out of Daz Studio into a 1.5 MB picture without scaling it down in pixel size?

    Thanks a lot,

    Me

    Not sure if this matters since you're not printing, but you may have 6 MB because your image is bigger.  

    From my calculations, your pic is about 31 x 27 inches.

    The pic you found online is about 11 x 6 inches.

    Have you tried rendering your image with the exact specifications as the pic you found online? 4000 x 2000 at 350 ppi.  Then compare file size.

  • FishtalesFishtales Posts: 6,212
    L'Adair said:
    Fishtales said:

    @L'Adair

    Under the Output Format/Options you can set the file size at the bottom of the JPEG options window, no need to do it a bit at a time :)

    I tried that, but it doesn't work without the RIOT plugin, and that plugin hasn't been updated to 64-bit yet, so I don't have it installed.If you're using the 64-bit version of Irfanview with the 32-bit RIOT plugin without issue, I'll go ahead and install it. That would really make things faster, and easier.

    I just tried it and dropped two 4.65 MB image to 144 KB :)

  • fastbike1fastbike1 Posts: 4,078

    @Wahil "Not sure if this matters since you're not printing, but you may have 6 MB because your image is bigger.  From my calculations, your pic is about 31 x 27 inches."

    DPI is not an inherent property of images. The iamge simply has the resolution, e.g. 2000 x 3000.

    For jpg, size of the image files is controlled by a number of things, but most directly by the compression level used.

  • SaldazSaldaz Posts: 168
    Wahil said:
    gibrril_fa945a6cee said:

    Hi!

    I just noticed something weird: when I render a 3000 x 2600 pixels pic in Iray, the result is a JPG file of about 6MB (at 96 DPI). Now I can find high res pictures online of comparable dimensions (4000 x 2000 pixels) at 350 dpi and those are 1.5 MB in size... So... How can I convert my 6 MB Jpeg out of Daz Studio into a 1.5 MB picture without scaling it down in pixel size?

    Thanks a lot,

    Me

    Not sure if this matters since you're not printing, but you may have 6 MB because your image is bigger.  

    From my calculations, your pic is about 31 x 27 inches.

    The pic you found online is about 11 x 6 inches.

    Have you tried rendering your image with the exact specifications as the pic you found online? 4000 x 2000 at 350 ppi.  Then compare file size.

    PPi/DPI values make no difference in digital files, this is just a number in the metadata along with things like date and other info.

    This number is not used for printing or display on screen and it does not affect the qualtiy or the resolution of the file (the resolution is 4000x2000). The only function is to calculate starting image size when the image is opened in applications that read it (like photoshop). This can then be changed to any other you like to get other document sizes. (just a starting number in image size calculators)

  • jestmartjestmart Posts: 4,449

    Never mind, just clearing the comment box.

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