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  1. #1
    3 Star Lounger
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    Resizing of Images

    Canon G3 digital camera has the option of RAW or JPG output format. I used to set 1600x1200 JPG as the default. This resolution is too large to be uploaded to my homepage and to be browsed on the Internet Explorer.

    I converted it to a smaller size, 640x480, by using Polyviews's conversion function. I found the color of 640x480 was distorted, compared to the original 1600x1200.

    First question: Is it normal to have some kind of color distortion when image is resized?

    Second question: If I use 1600x1200 RAW as the default, then convert it to 640x480 JPG. Will the quality of this JPG is better than that of 640x480 JPG converted from 1600x1200JPG. Of course, I can try it by myself to compare the result. But, I want to hear your comments first before jumping into it.

  2. #2
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    Re: Resizing of Images

    If you are using Windows XP, there is a PowerToy called "Image Resizer" This PowerToy enables you to resize one or many image files with a right-click. See http://www.microsoft.com/windowsxp/pro/dow...s/powertoys.asp, and it works real well.

    Now running HP Pavilion a6528p, with Win7 64 Bit OS.

  3. #3
    Super Moderator jscher2000's Avatar
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    Re: Resizing of Images (WARNING: IMAGES)

    Using Canon RAW (.CRW) is a lot of unnecessary work, IMHO. You really only need RAW format if you plan to do special things to the file (or if you're paranoid that you'll choose the wrong white balance).

    Regarding color "distortion," this depends on the settings in your image processing software and the quality of your original image. The following crops were downsized from a SuperFine quality JPG image shot with a G3. They were compressed to different degrees using Photoshop Elements' Save for the Web dialog:

    <table border=0 cellpadding=3 cellspacing=0><td>JPEG - High Quality (60%)</td><td>JPEG - Medium Quality (30%)</td><td><IMG SRC=http://home.att.net/~jscher2000/photos/HeadlampCropHighOpt.jpg></td><td><IMG SRC=http://home.att.net/~jscher2000/photos/HeadlampCropMediumOpt.jpg></td><tr><td>JPEG - Low Quality (10%)</td><td>GIF - "Web Palette"</td><td><IMG SRC=http://home.att.net/~jscher2000/photos/HeadlampCropLowOpt.jpg></td><td><IMG SRC=http://home.att.net/~jscher2000/photos/HeadlampCropWebPalette.gif></td></table>

    So your choices (and the software's flexibility) make a huge difference in image quality. (By the way, you can see the original, pre-shrunk image here.)

  4. #4
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    Re: Resizing of Images (WARNING: IMAGES)

    jscher2000, thank you for your help in this issue. In my point of view, the 30% in your picture will be good enough for me. Since the setting in my conversion was 70%, it seemed that the problem was caused by my original. I will do more testings to find the source of the problem.

    The Berkeley Pier Fisherman's Sunset is beautiful!

  5. #5
    Super Moderator jscher2000's Avatar
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    Re: Resizing of Images

    G3 bundle includes Photoshop LE 5.0, right? (I uninstalled it when I got Photoshop Elements.) Resizing in Photoshop might give you better results than that other program you mentioned. The interface is hard to find your way around at first, but after many months, it will start to seem more intuitive. <img src=/S/grin.gif border=0 alt=grin width=15 height=15>

    The basic steps for "downsampling" in PSLE are:
    1. <LI>Open image.
      <LI>Choose Image > Image Size...
      <LI>Make sure Constrain Proportions is checked
      <LI>Choose a resampling method (bicubic is the standard)
      <LI>Change the top box (width in pixels); the height in pixels should adjust proportionally
      <LI>Click OK
    Make sure to Save As... and not replace your original! (It's more confusing than helpful to deal with dimensions other than pixels, unless you want to print, in which case it would be better to take higher-resolution photos, e.g., "Large" 4 megapixel images.)

    P.S. Thanks for the comment on the photos. Of the 20+ shots I took there, that was my favorite.

  6. #6
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    Re: Resizing of Images

    I could not find the batch resizing function in the bundled Photoshop LE 5.0. There was no way to convert hundred of pictures one by one. It was the reason why I uninstall it and use Polyview. Even the ACDsee 4.0 came with HP 4400cxi did not have the batch conversion/resizing function in it either. These bundled FREE software are really out of date.

    Does Photoshop Element publish have the function of publishing pictures to website?

  7. #7
    Super Moderator jscher2000's Avatar
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    Re: Resizing of Images

    I don't know about batch operations. I only find about 1 of 10 pictures to be worth posting. Irfanview is very popular here and might have such a feature.

    Regarding publishing to the web, I generally use photo sites that have some kind of uploader. Pbase can unpack a .zip file; WebShots has a client side program. I haven't checked whether Photoshop Elements actually can publish to the web.

  8. #8
    Silver Lounger Bruce K's Avatar
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    Re: Resizing of Images

    Hi, Dennis ~

    This may be of some interest to you. Attached is a tiny app that does a lot of work for you very fast.<UL><LI>Create a folder and place selected JPGs in it<LI>Place 'htmlpics.exe' in the same folder<LI>Double-click 'htmlpics.exe'<LI>In 2 seconds, you will have created:<UL><LI>Thumbnails of all JPGs<LI>An HTML index page showing all thumbnails, each as a graphical link to the full size image<LI>An HTML page for each original sized JPG[/list]<LI>I don't know if there is a limit, but I have done 50 or 80 at a time[/list]

  9. #9
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    Re: Resizing of Images

    There doesn't seem to be a limit, I ran this in a scratch drive and it scanned each and every subfolder and spit out an enormous amount of thumbnails. Too bad it isn't more configurable, there are no runtime parameters and it doesn't seem to care if the images already exist - it just plows through the directory structure and dumps its output. This is a handy little EXE but I'd use it with a lot of caution.
    -Mark

  10. #10
    Silver Lounger Bruce K's Avatar
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    Re: Resizing of Images

    Hi, Mark ~

    It is quite handy. It is intended to be used within the one folder and that folder only. Then it will create only what is needed to be published and not plow through subfolders. I believe there are some parameters that can be controlled if run from the command line.

  11. #11
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    Re: Resizing of Images

    I tried the syntax htmlpics /? and it just fired off instead of presenting any runtime parameters - it would be great if I could find some of them out, because I'd like a little more control. I do, however, like what it does, it makes a lot of the work easier! I'll dig into the EXE if I find some time and see if it supports anything on the command line....even if it doesn't, the output is fairly good. I don't know what kind of compression it's using (the percentage of loss) but the thumbnails are legible enough anyway.
    -Mark

  12. #12
    Silver Lounger Bruce K's Avatar
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    Re: Resizing of Images

    Hi, Mark ~

    A very good friend of mine, Dave, wrote it for me to do just this. It is basically featureless by design to do the job quickly and then pretty up from there. I will ask him if there are parameters with which to work.

  13. #13
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    Re: Resizing of Images

    Excellent! Thanks Bruce, and thanks for sharing it with us too.
    -Mark

  14. #14
    Silver Lounger Bruce K's Avatar
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    Re: Resizing of Images

    <hr>Here's an updated version with some info when the program is run like:

    HTMLPics --help -OR-
    HTMLPics /?

    What other options would you want? Maybe I can allow you to specify the path to process (e.g. HTMLPics "c:My DocumentsMy Pictures")...
    <hr>

  15. #15
    Silver Lounger Bruce K's Avatar
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    Re: Resizing of Images

    Hi, Dennis ~

    Here is a handy little app that will resize all images in a given folder at once. Simply place the app in the folder, double-click it and it will resize all the JPGs inside that folder to 50% (by default) of the original with surprising quality.

    You can resize to any percentage you want by going to the command line, change directory to your folder of JPGs and enter <pre>> halfpics 75</pre>

    and hit enter. This will reduce them to 75% of the original, but you can just change the value for whichever percentage you desire.

    One note: The app will ignore files with '-half' in the name.

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