Image.Resize

public void Resize(int newWidth, int newHeight)

[C#]

string sourceFileName = "1.psd";
string exportPathPsd = "ResizeTest.psd";
string exportPathPng = "ResizeTest.png";

using (RasterImage image = Image.Load(sourceFileName) as RasterImage)
{
    image.Resize(190, 143);
    image.Save(exportPathPsd, new PsdOptions());
    image.Save(exportPathPng, new PngOptions() { ColorType = PngColorType.TruecolorWithAlpha });
}

public abstract void Resize(int newWidth, int newHeight, ResizeType resizeType)

public abstract void Resize(int newWidth, int newHeight, ImageResizeSettings settings)