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Re: Bash script with Image Magick to a Java program

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On Friday 27 May 2016 19:51 CEST, Duncan Idaho wrote:

> On 27/05/16 12:31, Cecil Westerhof wrote:
>> On Friday 27 May 2016 12:00 CEST, Martin Gregorie wrote:
>>
>>> On Fri, 27 May 2016 11:06:16 +0200, Cecil Westerhof wrote:
>>>
>>>> I evaluate things. Maybe I start with the standard library and as
>>>> my program evolves I switch. At the moment I know nothing about
>>>> graphical functionality in Java.
>>>>
>>> Whether the standard image classes in java.awt.image will do the
>>> job for you depends on the image source. I use it to produce
>>> thumbnails of JPG images but find that it can't correctly handle
>>> some JPGs from some sources. These are always B&W images, which
>>> result in a thumbnail of the correct requested size but distorted
>>> by being broken into vertical stripes separated by white 'bars'
>>> and, typically with the right-hand 1/3 or so of the original image
>>> not appearing in the thumbnail version.
>>
>> Well, I only work with color JPG files. ;-)
>>
>>
>>> This seems to be a deficiency in the Java library since the GIMP
>>> image manipulation program doesn't show this problem. I haven't
>>> tried Image Magik on these images so don't know what it would do.
>>>
>>> Starting with the standard class library and only moving on if you
>>> find things it can't do sounds like a good plot.
>>>
>>> My only other comment is that the documentation for the standard
>>> image library does rather assume that you are already up to speed
>>> on image manipulation and so you know what affine transforms, etc.
>>> are and why you should use each type of operation on an image and
>>> in what order. This isn't covered in the Java tutorials and there
>>> are no references to this sort of basic information.
>
> Just FYI
>
> I use the following Java libraries
>
> java.awt.Graphics;
> java.awt.Image;
> java.awt.image.BufferedImage;
> javax.imageio.ImageIO;
> javax.swing.ImageIcon;
>
> plus some standard libraries.
>
> along with the
>
> org.apache.commons.fileupload
>
> libraries
>
> To upload, scale and generate thumbnails and large images in jpg
> format for use in my home brewed Content Management System My source
> images are cropped square to a random convenient size.
>
> I have scaled tens of thousands of images and generated tens of
> thousands of thumbnails over the last five or so years with not a
> single problem
>
> The code hasn't been touched for many years, I can't even remember
> writing most of it :-) it's used almost every day.
>
> I'll let you have the code if you like. It could do with refactoring
> I expect, like I say it hasn't been touched for years.

That would be nice. If you like I will refactor it and send it back.
And if you like something implemented …

-- 
Cecil Westerhof
Senior Software Engineer
LinkedIn: http://www.linkedin.com/in/cecilwesterhof

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Thread

Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 00:42 +0200
  Re: Bash script with Image Magick to a Java program Jerry Stuckle <jstucklex@attglobal.net> - 2016-05-26 20:45 -0400
    Re: Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 11:01 +0200
  Re: Bash script with Image Magick to a Java program Arne Vajhøj <arne@vajhoej.dk> - 2016-05-26 22:06 -0400
    Re: Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 11:06 +0200
      Re: Bash script with Image Magick to a Java program Martin Gregorie <martin@address-in-sig.invalid> - 2016-05-27 10:00 +0000
        Re: Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 13:31 +0200
          Re: Bash script with Image Magick to a Java program Eric Douglas <e.d.programmer@gmail.com> - 2016-05-27 05:15 -0700
            Re: Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 15:18 +0200
          Re: Bash script with Image Magick to a Java program Duncan Idaho <duncan@dunenoemail.com> - 2016-05-27 18:51 +0100
            Re: Bash script with Image Magick to a Java program Martin Gregorie <martin@address-in-sig.invalid> - 2016-05-27 18:02 +0000
              Re: Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 23:23 +0200
            Re: Bash script with Image Magick to a Java program Cecil Westerhof <Cecil@decebal.nl> - 2016-05-27 23:18 +0200
              Re: Bash script with Image Magick to a Java program Duncan Idaho <duncan@dunenoemail.com> - 2016-05-28 08:03 +0100
      Re: Bash script with Image Magick to a Java program Arne Vajhøj <arne@vajhoej.dk> - 2016-05-27 17:59 -0400
  Re: Bash script with Image Magick to a Java program Brixomatic <brixomatic@yahoo.com> - 2016-05-29 17:28 +0200
  Re: Bash script with Image Magick to a Java program Eric Douglas <e.d.programmer@gmail.com> - 2016-06-14 10:25 -0700

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