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Thread: Downsizing photos

  1. #1
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    Default Downsizing photos

    I am a journalist and have to send photos by email. However, those I get are always too large. The other day, I found an application on Suse that allowed me to reduce the size of the photo. It had a percentage slide bar, which you moved one way or the other to save the photo as a different size. For the life of me, I cannot remember the application I used, or where on the menu this device is. Can anybody help? I have just got an 80MB photo and need it to be A LOT smaller to email!
    Thanks.

  2. #2

    Default Re: Downsizing photos

    image reduction is a big area, and there are very many packages that can do it, all suited to different ways of usage.

    Probablyt he most famous is Imagemagick which is probably (but not necessarily) on your default Suse, using command line:

    convert -resize 5% <orginalimagefilename> <newimagefilename>

    will reduce you image to 5% of its original size, no questions asked (I guess your 80MB to about 4MB).

    You could be talkign about Mirage ... Try feh some day, or xv. A host of others are available. Probably too many choices!

  3. #3
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    Default Re: Downsizing photos

    No, it is much much easier than this! I only have GNU Image, F-Spot Viewer and Eye of Gnome. It has to be one of these. You simply open the file and have a slider, you then save the downsized photo and voila. I did it once, but have such a duff memory....

  4. #4
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    Default Re: Downsizing photos

    I did this some time ago with digikam batch processing options, in the GUI menu. Resized a bunch of 1MB-10MB pictures to 640x480 or something.

  5. #5
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    Default Re: Downsizing photos

    Quote Originally Posted by Crossbone View Post
    No, it is much much easier than this! I only have GNU Image, F-Spot Viewer and Eye of Gnome. It has to be one of these. You simply open the file and have a slider, you then save the downsized photo and voila. I did it once, but have such a duff memory....
    You will often see such a slider when you save the image as a .jpeg. It is where the JPEG compression level is set. A low value (often a percentage) means high compression and lower image quality, and vice versa.

  6. #6
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    Default Re: Downsizing photos

    Yes, that's it! Thank you! Is there a way of downsizing a TIF? I don't mind the format, but can a TIF, for example, be saved as a JPEG?

  7. #7
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    Default Re: Downsizing photos

    Quote Originally Posted by Crossbone View Post
    Yes, that's it! Thank you! Is there a way of downsizing a TIF? I don't mind the format, but can a TIF, for example, be saved as a JPEG?
    Certainly, you can do that.

    However keep in mind that a JPEG is rather intended as an end-product, especially for on screen/online use. The compression that it uses is lossy and may significantly reduce image quality. TIFFs are rather geared towards high quality images that can further be worked on.

    And there are already compression methods that are 'inherent' to the TIFF format. If you use the Gimp, for example, to save a file as a TIFF you are prompted to choose amongst them. There is LZW, Pack Bits, JPEG, etc ...



    In the end, what you use to make your files smaller, depends heavily on the purpose of the images. And it may not be the worst idea to get back to the recipients of the files to ask them what they want (and maybe to ask for advice how you can achieve that best). The tools are all there, though, to resize, change formats, use lossy/lossless compression.

  8. #8
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    Default Re: Downsizing photos

    Don't confuse a slider that controls size on the screen with file size. Gwenview, the image viewer, has the display slider but resizing the file is done from the edit menu.

  9. #9
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    Default Re: Downsizing photos

    Thanks folks. I did go back, using your advice and have managed to find the way to downsize the image. I cheated, using MS Paint to change a TIF to a JPEG, which I then opened in GNU and saved. Upon saving, the slider is presented, which allows use to determine what size the image is saved as. The trick seems to be with JPEGs; with a TIF the slider did not appear...

  10. #10
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    Default Re: Downsizing photos

    TIF is a lossless format, there's no quality-loss compression involved. So there's not much sense in having a slider for it.

    You can open TIFF (and dozens of other formats) in GIMP, and save to jpg (and dozens of other formats).

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