A meeting place for general discussion about the ImageSharp libary https://github.com/sixLabors/ImageSharp
same parameters sent to the text
using a simple drawtext function that convert a string of rgb to the rgba you see above
textcanvas.Mutate(x => x.DrawText(StringToColor(values["c"]).ToString(), font, StringToColor(values["c"]), point));
using a simple drawtext function that convert a string of rgb to the rgba you see above
textcanvas.Mutate(x => x.DrawText(StringToColor(values["c"]).ToString(), font, StringToColor(values["c"]), point));
where I only have the core issue in
just wanted to hear if I was the first experiencing this or if not, there might be an idea to go for. If not, I'll create a new project with just this issue to share
the above code when refreshed on azure functions generate the green and the correct black from time to time
`
[FunctionName("IM1")]
public static async Task<IActionResult> Run1([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req, ILogger log)
{
Image<Rgba32> ProcessedImage;
using (Image<Rgba32> canvas = new Image<Rgba32>(800, 500))
{
canvas.Mutate(x => x.BackgroundColor(new Rgba32(255, 255, 255)));
ProcessedImage = canvas.Clone();
}
[FunctionName("IM1")]
public static async Task<IActionResult> Run1([HttpTrigger(AuthorizationLevel.Anonymous, "get", "post", Route = null)] HttpRequest req, ILogger log)
{
Image<Rgba32> ProcessedImage;
using (Image<Rgba32> canvas = new Image<Rgba32>(800, 500))
{
canvas.Mutate(x => x.BackgroundColor(new Rgba32(255, 255, 255)));
ProcessedImage = canvas.Clone();
}
using (Image<Rgba32> textcanvas = new Image<Rgba32>(800, 500))
{
var font = SystemFonts.CreateFont("Arial", 30);
Random rn = new Random();
float r = rn.Next(1,10);
float g = rn.Next(1,10);
float b = rn.Next(1,10);
var color = new Rgba32(r, g, b);
textcanvas.Mutate(x => x.DrawText(r + "-" + g + "-" + b + "---" + color.ToString(), font, color, new Point(0, 0)));
GraphicsOptions go = new GraphicsOptions();
ProcessedImage.Mutate(x => x.DrawImage(textcanvas, new Point(0, 0), go));
}
using (var returnImageStream = new MemoryStream())
{
ProcessedImage.Save(returnImageStream, new PngEncoder() { });
return new FileContentResult(returnImageStream.ToArray(), "image/png"); ;
}
}
made an updated version, where I insert a random number between 1 and 10 (seems mainly to happen with low numbers)
output contains the text and rgba color
https://wudimagemanipulator.azurewebsites.net/api/IM1
output contains the text and rgba color
https://wudimagemanipulator.azurewebsites.net/api/IM1
@dcasso can you try using a different encoder? bmp, or jpeg, to rule out the issue living in the encoder.. also try drawing the text directly onto
ProcessedImage instead of using DrawImage() too. Try to isolate down to the single operation that's introducing the discoloration. at the moment it could be DrawImage(), DrawText() or the png encode that's at fault
yeah that makes sense.. would probably have done the same depending on what's being drawing on each layer.... there's probably some little tricks to prevent having to allocate an image for every layer (but I would only think about that on an an optermisation pass personally).
@dcasso you can save time loading images you constantly use by storing them in memory cache against a key (you create if doesnt exist other wise just load). You will also get speed increase if you just store the pixel data in cache rather than the image format as this will save decode time. ImageSharp provides ways of reading pixel data directly so you will have everything you need.
@saucecontrol Just got RLE ported. Worked first time which was nice! Compression at level 1 isn't as good as Deflate.Fast but I've yet to test it across different medium.
Ah, I didn't realize it had the same match length limit. Saw these examples before where RLE had a good showing on anything with big patches of similar color http://optipng.sourceforge.net/pngtech/z_rle.html
but I've never done any tests myself
was also thinking of AI based compression
something like
var image = new Image<Rgba32>(5,5);
var image = new Image<Rgba32>(5,5);
i guess im used to always mocking the interface rather than newing things up like that