Using MagickReadSettings to read in a jpeg at different dimensions to file, Correct usage?

[MartinSnaparazzi]

Hi
I'm trying to use the MagickReadSettings width and height to load in a jpeg at a smaller resolution

Original file is Jpeg 2976x1984 8-bit sRGB

MagickReadSettings settings = new MagickReadSettings();
settings.Width = 744;
settings.Height = 496;
MagickImage image = new MagickImage(fileName, settings);

This doesn't affect the image dimensions
Result: {Jpeg 2976x1984 8-bit sRGB}

MagickReadSettings settings = new MagickReadSettings();
settings.SetDefine(MagickFormat.Jpeg, "size", "800x600");
MagickImage image = new MagickImage(fileName, settings);

Dimensions changed
Result: {Jpeg 1116x744 8-bit sRGB}

MagickReadSettings settings = new MagickReadSettings();
settings.SetDefine(MagickFormat.Jpeg, "size", "744x496");
MagickImage image = new MagickImage(fileName, settings);

Dimensions changed
Result: {Jpeg 744x496 8-bit sRGB}

So it seems set define works but id have thought setting width and height directly would be trying to do the same thing?

[dlemstra]

The jpeg size option is a special feature and also doesn't guarantee the output image will be that size and will also not work in al situations. The width and height in the MagickReadSettings are used by different parts of the library. For example reading an image in a specific color And it those situations you are guaranteed an image in the specified dimensions and that is probably why this was made a special option.