Legacy ImageMagick Discussions Archive

I've just switched from using ImageMagick 6.7.3-Q16 on aWindows 32 bit computer under windows 7 to ImageMagick-6.8.7-Q16 on a Windows 64 bit computer under Windows 7. I'm interfacing to the ImageMagick MagickWand interface from a foreign function interface from a scripting language called Racket ...

Using MagickWand API I want to set the background color to white for a grayscale image.

I have an example for doing this in rgb as follows but I'm not sure how to specify "white for a grayscale image in the following example:
pwo = NewPixelWand();
PixelSetColor(pwo,"rgb(60%,60%,60 ...

Thanks Pete!

When I use MagickDeskewImage from the C Wand API to deskew an image input from MagickReadImage, if the input file is a jpg then the additional background from the deskew rotation is white, but if the input file is a gif file then the additional background from the deskew rotation is black.

The ...

I'm developing an OCR application and using the Wand C api. (I'm new to ImageMagick). I'm using MagickExportPixels on a grayscale (monochrome) image to extract the pixel data. It works just fine but I'd like to speed it up if I could and I noticed that there are also pixel iterator methods and pixel ...

I need to use the deskew function from the MagickWand C api.
i.e.
MagickBooleanType MagickDeskewImage(MagickWand *wand,
const double threshold)

What is the parameter "threshold". What should it be set to and how does the setting of this parameter affect the deskew function?

Thanks,
Harry Spier