/// <summary>
/// Test encode functions
/// </summary>
private void ButtonSave_Click(object sender, System.EventArgs e)
{
byte[] rawWebP;
try
{
if (this.pictureBox.Image == null)
{
MessageBox.Show("Please, load an image first");
}
//get the picturebox image
Bitmap bmp = (Bitmap)pictureBox.Image;
//Test simple encode lossly mode in memory with quality 75
string lossyFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "SimpleLossy.webp");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossy(bmp, 75);
File.WriteAllBytes(lossyFileName, rawWebP);
MessageBox.Show("Made " + lossyFileName, "Simple lossy");
//Test encode lossly mode in memory with quality 75 and speed 9
string advanceLossyFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "AdvanceLossy.webp");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossy(bmp, 71, 9, true);
File.WriteAllBytes(advanceLossyFileName, rawWebP);
MessageBox.Show("Made " + advanceLossyFileName, "Advance lossy");
//Test simple encode lossless mode in memory
string simpleLosslessFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "SimpleLossless.webp");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossless(bmp);
File.WriteAllBytes(simpleLosslessFileName, rawWebP);
MessageBox.Show("Made " + simpleLosslessFileName, "Simple lossless");
//Test advance encode lossless mode in memory with speed 9
string losslessFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "AdvanceLossless.webp");
using (WebP webp = new WebP())
rawWebP = webp.EncodeLossless(bmp, 9, true);
File.WriteAllBytes(losslessFileName, rawWebP);
MessageBox.Show("Made " + losslessFileName, "Advance lossless");
//Test encode near lossless mode in memory with quality 40 and speed 9
// quality 100: No-loss (bit-stream same as -lossless).
// quality 80: Very very high PSNR (around 54dB) and gets an additional 5-10% size reduction over WebP-lossless image.
// quality 60: Very high PSNR (around 48dB) and gets an additional 20%-25% size reduction over WebP-lossless image.
// quality 40: High PSNR (around 42dB) and gets an additional 30-35% size reduction over WebP-lossless image.
// quality 20 (and below): Moderate PSNR (around 36dB) and gets an additional 40-50% size reduction over WebP-lossless image.
string nearLosslessFileName = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "NearLossless.webp");
using (WebP webp = new WebP())
rawWebP = webp.EncodeNearLossless(bmp, 40, 9, true);
File.WriteAllBytes(nearLosslessFileName, rawWebP);
MessageBox.Show("Made " + nearLosslessFileName, "Near lossless");
MessageBox.Show("End of Test");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message + "\r\nIn WebPExample.buttonSave_Click", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
}