void RegenerateVideoThumbnail(string sourceFile, string destThumb)
{
DumpImageFromVideo(sourceFile, destThumb);
var width = 240;
var height = 160;
using (var wand = new MagickWand(destThumb))
{
float idealAspect = (float)width / (float)height;
float actualAspect = (float)wand.ImageWidth / (float)wand.ImageHeight;
if (idealAspect >= actualAspect)
{
width = (int)(actualAspect * (float)height);
}
else
{
height = (int)((float)width / actualAspect);
}
wand.ScaleImage((uint)width, (uint)height);
// sharpen after potentially resizing
// http://www.imagemagick.org/Usage/resize/#resize_unsharp
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008);
wand.WriteImage(destThumb, true);
}
}
void GenerateThumbnail(Ffmpeg ffmpeg, string localSourceFile, string localThumbnailFile, MovieMetadata mm)
{
ffmpeg.ExtractFrame(localSourceFile, localThumbnailFile, GetThumbnailSeconds(mm));
using (var wand = new MagickWand(localThumbnailFile))
{
wand.GetLargestDimensionsKeepingAspectRatio(THUMB_WIDTH, THUMB_HEIGHT, out uint width, out uint height);
wand.ScaleImage(width, height);
// sharpen after potentially resizing
// http://www.imagemagick.org/Usage/resize/#resize_unsharp
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008);
wand.WriteImage(localThumbnailFile, true);
mm.ThumbHeight = (int)height;
mm.ThumbWidth = (int)width;
}
}
void GenerateThumbSq(Ffmpeg ffmpeg, string localSourceFile, string localThumbSqFile, MovieMetadata mm)
{
ffmpeg.ExtractFrame(localSourceFile, localThumbSqFile, GetThumbnailSeconds(mm));
using (var wand = new MagickWand(localThumbSqFile))
{
var width = (double)wand.ImageWidth;
var height = (double)wand.ImageHeight;
var aspect = width / height;
if (aspect >= THUMB_SQ_ASPECT)
{
var newWidth = (width / height) * THUMB_SQ_HEIGHT;
// scale image to final height
wand.ScaleImage((uint)newWidth, THUMB_SQ_HEIGHT);
// crop sides as needed
wand.CropImage(THUMB_SQ_WIDTH, THUMB_SQ_HEIGHT, (int)(newWidth - THUMB_SQ_WIDTH) / 2, 0);
}
else
{
var newHeight = THUMB_SQ_WIDTH / (width / height);
// scale image to final width
wand.ScaleImage(THUMB_SQ_WIDTH, (uint)newHeight);
// crop top and bottom as needed
wand.CropImage(THUMB_SQ_WIDTH, THUMB_SQ_HEIGHT, 0, (int)(newHeight - THUMB_SQ_HEIGHT) / 2);
}
// sharpen after potentially resizing
// http://www.imagemagick.org/Usage/resize/#resize_unsharp
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008);
wand.WriteImage(localThumbSqFile, true);
mm.ThumbSqHeight = THUMB_SQ_HEIGHT;
mm.ThumbSqWidth = THUMB_SQ_WIDTH;
}
}
public void Generate()
{
using (var wand = new MagickWand(_sourcePath))
{
var width = (double)wand.ImageWidth;
var height = (double)wand.ImageHeight;
var aspect = width / height;
if (aspect >= Aspect)
{
var newWidth = (width / height) * FinalHeight;
// scale image to final height
wand.ScaleImage((uint)newWidth, FinalHeight);
// crop sides as needed
wand.CropImage(FinalWidth, FinalHeight, (int)(newWidth - FinalWidth) / 2, 0);
}
else
{
var newHeight = FinalWidth / (width / height);
// scale image to final width
wand.ScaleImage(FinalWidth, (uint)newHeight);
// crop top and bottom as needed
wand.CropImage(FinalWidth, FinalHeight, 0, (int)(newHeight - FinalHeight) / 2);
}
// sharpen after potentially resizing
// http://www.imagemagick.org/Usage/resize/#resize_unsharp
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008);
wand.WriteImage(_destPath, true);
}
ExecuteJpegOptimAsync(_destPath);
ExecuteJpegTranAsync(_destPath);
}
public void ComposedTest()
{
var contrastRatioThreshold = 0.5;
var tooContrastyThreshold = 1.9;
MagickWandEnvironment.Genesis();
PrintStatsHeader();
foreach(var file in _files)
{
using(var wand = new MagickWand(file))
{
double mean, stddev;
wand.GetImageChannelMean(ChannelType.AllChannels, out mean, out stddev);
PrintStats(file, wand);
wand.AutoLevelImage();
var contrastRatio = stddev / mean;
var contrastyRatio = stddev / 10000;
if(contrastRatio < contrastRatioThreshold)
{
var saturationAmount = Convert.ToInt32((contrastRatioThreshold - contrastRatio) * 100) * 4;
// limit the saturation adjustment to 20%
if(saturationAmount > 20)
{
saturationAmount = 20;
}
saturationAmount += 100;
Console.WriteLine("modulating by: " + saturationAmount);
// 100 = don't adjust brightness
// 300 = don't rotate hue
wand.ModulateImage(100, saturationAmount, 300);
}
else if(contrastyRatio > tooContrastyThreshold)
{
Console.WriteLine("attempting to reduce contrast");
wand.SigmoidalContrastImage(true, 2, 0); // smooth brightness/contrast
}
wand.UnsharpMaskImage(0, 0.7, 0.7, 0.008); // sharpen
WriteImage("composed", file, new string[] { }, wand);
}
}
MagickWandEnvironment.Terminus();
}