Legacy ImageMagick Discussions Archive

The oldest IM I have is 6.5.8-8, which gives me the same results as 6.8.5-8. But it might use a different delegate to your setup. I'm not an expert at IM configuration with libraries etc etc.

Inkscape is generally more comprehensive than IM at reading SVG files.

What is in test.svg? It might specify a large number of pixels, so convert (or its delegate) tries to make a massive image, causing the memory allocation failure.

After copying your example into grad.svg, for IM 6.8.5-8 on Windows 7, I get the expected 100x100: D:\web\im>%IM%identify grad.svg grad.svg SVG 100x100 100x100+0+0 16-bit sRGB 478B 0.031u 0:00.021 D:\web\im>%IM%convert grad.svg g.png D:\web\im>%IM%identify g.png g.png PNG 100x100 100x100+0+0 16-bit ...

I don't know what this command would try to do: Better would be:

According to the documentation and in practise, "-colorize N" doesn't need a percent sign. Adding a percent sign seems harmless. I did fluff my final command: the mask should be the negative of what I created, ie my "-negative" was wrong. So this is what I get (Windows script): s...

For my solution, I supposed that one of the "good" colours was red, but then changed all the bad pixels to red. Doh! Almost any other colour would have been better.

There are many ways to approach this. Here is one. Suppose your source image is src.png. 1. Make an image that contains the "good" colours. I'll just have three. convert xc:red xc:rgb(34,56,89) xc:green -append goodCols.png 2. Make a new version of the source, containing just the "goo...

Yes. "Brightness" is the maximum of RG and B; "Average" is the average, and "Lightness" should be the average of the minimum and maximum. To complete the picture, perhaps we could also have a "Minimum", though I can't see any use for it.

Exactly which v6.7? Colorspaces (including greyscale) changed a lot during that version. Using your mountain photo: "%IMG679%convert" mountains.jpg -set colorspace RGB -equalize e679.png "%IMG682%convert" mountains.jpg -set colorspace RGB -equalize e682.png "%IMG685%convert&...

"-quality" refers to the data loss when saving files, especially in JPG format. It is just a number that happens to be between 0 and 100, not a percentage. Good places to start learning about IM: http://www.imagemagick.org/script/command-line-options.php http://www.imagemagick.org/script/c...

IM 6.8.5-8 on Windows 7. The documentation for "-intensity" (http://www.imagemagick.org/script/command-line-options.php#intensity) claims Lightness is the average of the min and max RGB values, and that "-grayscale" should do the same. Lightness (min(R', G', B') + max(R', G', B')...

For this, you almost certainly need "-density". Vector images in PDF have no perfect setting for density. In general, higher numbers give higher quality. Raster images in PDF work best when "-density" is an integer multiple (or fraction) of the original. For example, if the origi...

Are you converting 1000 at once? Can you convert just one file?

You can find out the exact command issued: I don't know of any other options to suppress warnings from GS. You can redirect stderr, of course.

When you append, won't all values (every channel of every pixel) show in the histogram? Yes. Averaging is a primitive form of greyscale conversion. Appending uses the actual values of each channel. The difference can be readily seen: convert xc:red xc:lime xc:blue -append test.png convert test.png ...