Legacy ImageMagick Discussions Archive

Hi, I am really green at this, so please be patient.

I am trying to set up a webcam, and have the camera, software and computer working ok. But I was following the example of another webcam site where they use ImageMagick command line (Convert) commands to shrink the main picture down to several smaller versions. I have the script from that site, but I can't get the commands to work -- I just get error messages.

I downloaded and installed the "Windows Binary Release", ImageMagick-6.4.8-6-Q16-windows-dll.exe on my Vista laptop, so now I have all 40 Mb under C:\Program Files\ImageMagick.

The website says: To verify ImageMagick is working properly, type the following in an MS-DOS Command Prompt window:
convert logo: logo.gif
identify logo.gif
imdisplay logo.gif

But I get errors like: Invalid Parameter - logo.gif

So I hope someone can help me out. Did I download and install the wrong thing? Is there a smaller size installation if I just want to use the convert command line commands? ...or is there a better tool to do what I need.

Reading the documentation on-line, it appears I am really a fish out of water. I will certainly appreciate any help.

Windows also has a convert command and that is probably what is actually being executed.
I get around it by renaming the ImageMagick convert to imconvert.exe and then use:
imconvert logo: logo.gif

Pete

Ah! That helps. Thanks.

I copied the convert.exe file to one named imconvert.exe. Then opening a cmd.exe window, I changed directory to C:\Program Files\ImageMagick\images. I set the path to C:\Program Files\ImageMagick and then tried the above commands. But there is still trouble:

c:\Program Files\ImageMagick\images> imconvert logo: logo.gif
imconvert: unable to open image `logo.gif': No such file or directory @ blob.c/OpenBlob/2411.

c:\Program Files\ImageMagick\images> imconvert logo: logo.jpg
imconvert: unable to open image `logo.jpg': No such file or directory @ blob.c/OpenBlob/2411.

c:\Program Files\ImageMagick\images> dir logo*.*

Directory of c:\Program Files\ImageMagick\images
08/25/2007 07:19 PM 20,337 logo.jpg

There is no logo.gif file, but there IS logo.jpg. The other two commands, identify and imdisplay, work if I use logo.jpg as the file name.

What happened to logo.gif?

Thanks.

At the moment I can't see what's wrong with what you did.
I can only suggest that you try those commands from the c:\Program Files\ImageMagick directory.

Pete

el_supremo wrote:I can only suggest that you try those commands from the c:\Program Files\ImageMagick directory.

I tried that with same file not found error message.

I used a search utility, and the only "logo" file in that directory tree is logo.jpg

I don't know if anyone tries to keep the documentation on the site up to date, but maybe that should be changed.

Thanks for your help, Pete.

The logo.jpg image was already in the images subdirectory as part of the distribution.
The "logo:" image is built in to IM and because of that the first convert command "cannot" fail. It is just converting an internal image to a gif or jpg.
At a DOS prompt try the commands: and post the output here.

And to answer one of your original questions, if you're going to use IM with a webcam you don't need the precision that you'd get from the Q16 DLL version of IM. I would uninstall it and install the Q8 DLL version.

Pete