Legacy ImageMagick Discussions Archive

That pre thumbnailing makes sense and is similar to how I handle tracking large amounts of autocad drawings. I tried the %r on a png which is 8 bit indexed RGB color, and it gave back DirectClassRGBMatte. I double checked the format of the image with Corel PhotoPaint, and it was still 8 bit indexed....

ah! thanks a bunch for clarifying that.
Hope I can contribute back sometime as I use IM more and more in Engineering.

I read the suggested usage section, but those examples do not address the issue of if an image has an indexed color palette, or RGB. Also, they use the -verbose option of idetify, which locks up on most large images I have. I was impressed at the cleverness of how to categorize images, its just that...

ah, did not see that section before, will read.
The problem (possibly unavoidable) id the %k takes a long time on big images.
I am seeing 5 to 10 second second return times.
At least it handle the large images, not like my previous GDI routines in C#.

I am making tools that do conversions and make decisions based on if an image fits these categories: 1 bit black and white 8 bit greyscale 8 bit RGB indexed palette 24 bit RGB everything else above that is considered 24 bit RGB to me, since we just handle that as a "full color" image, as t...

I tried that and many other combinations, I get 24 bit every time. I even uninstalled Q16 and put on Q8 version, same results. One clue is if I just run a: convert USGS.tif -depth 8 USGS8.tif It errors out. It says a bunch of lines like "unexpected field...". The sizing works fine, its the...

I tried that just now, did not work. The size action worked fine but I got a 24 bit rgb image instead of 8 bit. Any reason why I should be using the Q16 as opposed to Q8? I just chose the one that looked the most powerful. Maybe its not suited to people that only work with 24bit and lower colors. th...

I typically keep images of maps and things as tifs with 8-bit color, with an optimized palette. I do this through corel photo paint. Many times, I want to resize a map or photo by 50%. I am using convert.exe so I tried: convert USGS.tif -resize 50%% -compress rle USGSsmaller.tif The %% is because I ...

I do a couple things with Corel PP that I want to do with IM. 1) Convert a 24 bit color image to 8 bit. In PP, there is an option to use "optimized palette", which basically gives a very nice match between the old and new image, even though the color depth went down. How do I do this with ...