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reducing image file pixel size

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  • reducing image file pixel size

    I'm going to try again to see if someone has a solution. All day long we get photographs in JPG format that are ~ 4000 pixels x ~4000 pixels, because that's the resolution that current phones are taking pictures at and we haven't a way to have the hundreds of providers that deliver pictures to us have efficient methods to download their images in a reduced format. So has someone found a way to loop through jpg image files and reduce the image files from 4000 x 4000 to maybe 400 x 400 with xbasic. Having worked through this endlessly, as far as all my testing goes, I have concluded that the methods in Alpha gag at images at ~ 2000 x ~ 2000 pixels. Any help here would be massively appreciated. You out there Finian!
    Mike W
    __________________________
    "I rebel in at least small things to express to the world that I have not completely surrendered"

  • #2
    Re: reducing image file pixel size

    Mike, why do you need an xbasic solution? There are dozens of products out there that will do what you want, some free some paid for, that you can call from within Alpha.

    I found a batch solution in 2 minutes using a google search of "jpeg reduce resolution batch" using a product called ffmpeg

    Comment


    • #3
      Re: reducing image file pixel size

      Code:
      dim pp as p
      pp = a5_getimagesize("C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi.jpg")
      ?pp
      = errorText = ""
      hasError = .F.
      height = 7.5
      heightPixels = 720
      width = 13.333333333333334
      widthPixels = 1280
      
      ?a5_scale_imagefile("C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi.jpg","C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi2.jpg",0,100,"pixels","width","Proportional",0,0,.T.)
      = <No data returned>
      
      pp = a5_getImagesize("C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi2.jpg")
      ?pp
      = errorText = ""
      hasError = .F.
      height = 0.583333333333333
      heightPixels = 56
      width = 1.041666666666667
      widthPixels = 100
      mike, this is done via interactive window setting only the width property to 100 and making the height proportional, scaling the image.
      I am sure you can improve this.
      thanks for reading

      gandhi

      version 11 3381 - 4096
      mysql backend
      http://www.alphawebprogramming.blogspot.com
      [email protected]
      Skype:[email protected]
      1 914 924 5171

      Comment


      • #4
        Re: reducing image file pixel size

        Hi Jon,
        The files we work with are jpg files. And we need this because we deal with thousands of images. One root folder with 100 or so sub folders having 10-20 randomly named files like IM3AAEED6EF.jpg, that are to be reduced, renamed and re-distributed to other folders.

        Hi Gandhi,
        Thanks for responding. Yes I have seen this and tried it but the use of ImageMagic uses convert.exe, and I haven't been able to figure out how to get this exe file to run without triggering the User Account Control permission dialog. I'm still researching this.
        Mike W
        __________________________
        "I rebel in at least small things to express to the world that I have not completely surrendered"

        Comment


        • #5
          Re: reducing image file pixel size

          mike,
          I tried setting false for imagemagik it seems to work without any problem.
          Code:
          dim pp as p
          pp = a5_getimagesize("C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi.jpg")
          ?pp
          = errorText = ""
          hasError = .F.
          height = 7.5
          heightPixels = 720
          width = 13.333333333333334
          widthPixels = 1280
          
          a5_scale_imagefile("C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi.jpg","C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi3.jpg",0,100,"pixels","width","Proportional",0,0,[COLOR="#FF0000"].F.[/COLOR])
          
          pp = a5_getimagesize("C:\Users\Govindan\Documents\Alpha Five V11\alpha_software\gandhi3.jpg")
          ?pp
          = errorText = ""
          hasError = .F.
          height = 0.583333333333333
          heightPixels = 56
          width = 1.041666666666667
          widthPixels = 100
          I did not do this in a script file, it could be different there as you say.
          thanks for reading

          gandhi

          version 11 3381 - 4096
          mysql backend
          http://www.alphawebprogramming.blogspot.com
          [email protected]
          Skype:[email protected]
          1 914 924 5171

          Comment


          • #6
            Re: reducing image file pixel size

            Hi Gandhi,
            Yup it works with the ImageMagic=".f." without the Security dialog showing. But look at the results (see pic). 3000 x 5300 pixel image --> 500 x 900 pixel.
            Attached Files
            Mike W
            __________________________
            "I rebel in at least small things to express to the world that I have not completely surrendered"

            Comment


            • #7
              Re: reducing image file pixel size

              Originally posted by Mike Wilson View Post
              Hi Jon,
              The files we work with are jpg files. And we need this because we deal with thousands of images. One root folder with 100 or so sub folders having 10-20 randomly named files like IM3AAEED6EF.jpg, that are to be reduced, renamed and re-distributed to other folders.

              Hi Gandhi,
              Thanks for responding. Yes I have seen this and tried it but the use of ImageMagic uses convert.exe, and I haven't been able to figure out how to get this exe file to run without triggering the User Account Control permission dialog. I'm still researching this.
              Have you tried Tweak UAC? It sets the UAC to 'quiet' mode - no prompts,
              Robin

              Discernment is not needed in things that differ, but in those things that appear to be the same. - Miles Sanford

              Comment


              • #8
                Re: reducing image file pixel size

                Originally posted by Mike Wilson View Post
                Hi Gandhi,
                Yup it works with the ImageMagic=".f." without the Security dialog showing. But look at the results (see pic). 3000 x 5300 pixel image --> 500 x 900 pixel.
                terrible. you may have to follow what robin suggested.
                thanks for reading

                gandhi

                version 11 3381 - 4096
                mysql backend
                http://www.alphawebprogramming.blogspot.com
                [email protected]
                Skype:[email protected]
                1 914 924 5171

                Comment


                • #9
                  Re: reducing image file pixel size

                  Thanks Robin, will take a look. It is working for us setting the level to no report, then up again after uses, but that is a pain!
                  Mike W
                  __________________________
                  "I rebel in at least small things to express to the world that I have not completely surrendered"

                  Comment

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