Gradient Caption Magick.NET #781

Nihaarn1997 · 2020-11-10T11:37:47Z

Nihaarn1997
Nov 10, 2020

Hi,
I am working on a C# project which currently invokes IM commands for creating images with titles. I'm now switching over to using Magick.NET.
Having trouble converting the following command to Magick.NET -
convert -size 374x550 -background none -font "PathToFontFile" -gravity center caption:"Title" ( -clone 0 -alpha opaque -sparse-color Barycentric "0, 0 #070504 %[fx:w-1],0 #000000" ) ( -clone 0 -alpha transparent ) -reverse -compose dstover -composite "PathToLocation"

I'd really appreciate any help as I have been stuck on this for weeks now.

Thanks
Nihaar Nandedkar

(Note: Below is an example of what I am trying to achieve)

dlemstra · 2020-11-10T16:37:55Z

dlemstra
Nov 10, 2020
Maintainer

What have you tried so far? At what point are you stuck?

0 replies

Nihaarn1997 · 2020-11-11T07:38:54Z

Nihaarn1997
Nov 11, 2020
Author

What we have tried:

Successfully overlaid gradient text over an image using the IM command as stated in the issue
Overlay single color text over an image using the read() and composite() methods of Magick.NET

Where we are stuck:

Switching over from using IM commands to Magick.NET library
Below is an example of how we achieved vertical, horizontal and arc gradient overlay text

convert -size 374x550 -background none -font "PathToFontFile" -gravity center caption:"Nations Cup" ( -clone 0 -alpha opaque -sparse-color Barycentric "0, 0 #070504 %[fx:w-1],0 #000000" ) ( -clone 0 -alpha transparent ) -reverse -compose dstover -composite "PathToLocation"

convert -size 374x550 -background none -font "PathToFontFile" -gravity center caption:"Nations Cup" ( -clone 0 -alpha opaque -sparse-color Barycentric "0, 0 #070504 0,%[fx:h-1], #000000" ) ( -clone 0 -alpha transparent ) -reverse -compose dstover -composite "PathToLocation"

convert -size 374x550 -background none -font "PathToFontFile" -gravity center caption:"Nations Cup" ( +clone -sparse-color Barycentric "0, %h #070504 %w,0 #000000" ) -compose In -composite -virtual-pixel transparent -distort arc 80 ( +clone -background none -shadow 100x2+4+4 ) +swap -background none -compose over -layers merge +repage "PathToLocation"

The gradient effect (vertical, horizontal & arc) requires 2 colors as input and a few other parameters along with it, not sure how to pass to to the below code

         MagickReadSettings settings = new MagickReadSettings();
         settings.FillColor = MagickColor.FromRgb(r, g, b);
         settings.Font = ConfigurationManager.AppSettings["fontpath"] + singleFont.SystemFontName;
         settings.Width = writableDetails.WidthWritable;
         settings.Height = writableDetails.HeightWritable;
         settings.BackgroundColor = MagickColor.FromRgba(255, 255, 255, 0);
         settings.TextGravity = Gravity.Center;
         settings.TextInterlineSpacing = writableDetails.InterlineSpace;

0 replies

dlemstra · 2020-11-16T10:50:26Z

dlemstra
Nov 16, 2020
Maintainer

The example command that you have does not create the sample image that you provided? Here is a translation of your first command:

convert -size 374x550 -background none -font "PathToFontFile" -gravity center caption:"Nations Cup"
( -clone 0 -alpha opaque -sparse-color Barycentric "0, 0 #070504 %[fx:w-1],0 #000000" )
( -clone 0 -alpha transparent ) -reverse -compose dstover -composite "PathToLocation"

var readSettings = new MagickReadSettings
{
    // -size 374x550
    Width = 374,
    Height = 550,

    // -background none
    BackgroundColor = MagickColors.None,

    // -font "PathToFontFile"
    Font = "PathToFontFile",

    // -gravity center
    TextGravity = Gravity.Center,
};

// caption:"Nations Cup"
using (var image = new MagickImage("caption:Nations Cup", readSettings))
{
    // -clone 0
    using (var clone1 = image.Clone())
    {
        // -alpha opaque
        clone1.Alpha(AlphaOption.Opaque);

        // -sparse-color Barycentric "0, 0 #070504 %[fx:w-1],0 #000000"
        var sparseColorArgs = new[]
        {
            // 0, 0 #070504
            new SparseColorArg(0, 0, new MagickColor("#070504")),

            // %[fx:w-1],0 #000000
            new SparseColorArg(image.Width - 1, 0, new MagickColor("#000000")),
        };

        // -sparse-color Barycentric
        clone1.SparseColor(SparseColorMethod.Barycentric, sparseColorArgs);

        // -clone 0
        using (var clone2 = image.Clone())
        {
            // -alpha transparent
            clone2.Alpha(AlphaOption.Transparent);

            // -reverse changes the order of the images. The order was:
            // image, clone1, clone2 but this is not clone2, clone1, image.

            // -compose dstover -composite
            // Because there are there images some special magick is happening.
            using (var clone3 = clone2.Clone())
            {
                clone2.Composite(clone1, CompositeOperator.DstOver);

                clone2.Composite(image, CompositeOperator.CopyAlpha);

                clone3.Composite(clone2, CompositeOperator.Over);

                // "PathToLocation"
                clone3.Write("PathToLocation");
            }
        }
    }
}

Feel free to ask if you have any further questions.

0 replies

Nihaarn1997 · 2020-11-20T14:35:35Z

Nihaarn1997
Nov 20, 2020
Author

Thanks for the help, the above code worked perfectly for both horizontal and vertical gradient effects.
Replaced

SparseColorArg[] sparseColorArgs = new SparseColorArg[2];
sparseColorArgs[0] = new SparseColorArg(0, 0, new MagickColor(singleColor1.TextColor));
if (gradient_vertical)
                sparseColorArgs[1] = new SparseColorArg(0, imgMain.Height - 1, new MagickColor(singleColor2.TextColor));
else if (gradient_horizontal)
                sparseColorArgs[1] = new SparseColorArg(imgMain.Width - 1, 0, new MagickColor(singleColor2.TextColor));

We need help with overlaying the caption in an arc where we pass the angle of arc as parameter to the IM command. Below is the command for it

convert -size 374x550 -background none -font "PathToFontFile" -gravity center caption:"Nations Cup" ( +clone -sparse-color Barycentric "0, %h #070504 %w,0 #000000" ) -compose In -composite -virtual-pixel transparent -distort arc 80 ( +clone -background none -shadow 100x2+4+4 ) +swap -background none -compose over -layers merge +repage "PathToLocation"

Can you please help us in translating this command to Magick.NET code?

0 replies

dlemstra · 2020-12-01T21:14:33Z

dlemstra
Dec 1, 2020
Maintainer

What have you tried yourself and where are you stuck?

5 replies

Nihaarn1997 Dec 7, 2020
Author

Sorry for replying so late. Had a long weekend. Below is a code snippet of what we have tried -

            MagickReadSettings settings = new MagickReadSettings();
            settings.BackgroundColor = MagickColors.None;
            settings.FillColor = new MagickColor("#7fffd4");
            settings.Font = ConfigurationManager.AppSettings["fontpath"] + singleFont.SystemFontName;
            settings.Width = writableDetails.WidthWritable;
            settings.Height = writableDetails.HeightWritable;
            settings.TextGravity = Gravity.Center;
            if (writableDetails.InterlineSpace != 0)
            {
                settings.TextInterlineSpacing = writableDetails.InterlineSpace;
            }

            if (singleFont.StrokeWidth != 0)
            {
                settings.StrokeColor = MagickColors.Violet;
                settings.StrokeWidth = singleFont.StrokeWidth;
            }

            MagickImage background = new MagickImage(imageDetails.ImagePath);

            MagickImage imgMain = new MagickImage(MagickColors.None, writableDetails.WidthWritable, writableDetails.HeightWritable);
            imgMain.ColorFuzz = new Percentage(100);
            imgMain.Transparent(MagickColors.White);
            imgMain.Read("caption:" + "Bledisloe Cup", settings);
            imgMain.Composite(imgMain, Gravity.Center, CompositeOperator.Over);

            MagickImage clone1 = (MagickImage)imgMain.Clone();
                clone1.Alpha(AlphaOption.Opaque);
                SparseColorArg[] sparseColorArgs = new SparseColorArg[2];
                if (arc)
                {
                    sparseColorArgs[0] = new SparseColorArg(0, imgMain.Height, new MagickColor("#7fffd4"));
                    sparseColorArgs[1] = new SparseColorArg(imgMain.Width, 0, new MagickColor("#00FF00"));
                    clone1.SparseColor(SparseColorMethod.Barycentric, sparseColorArgs);
                    MagickImage clone2 = (MagickImage)imgMain.Clone();
                    clone2.VirtualPixelMethod = VirtualPixelMethod.Transparent;
                    clone2.Distort(DistortMethod.Arc, 80);

                    MagickImage imgShadow = (MagickImage)imgMain.Clone();
                    imgShadow.Shadow(5, 5, 3, (Percentage)80);
                        imgShadow.BackgroundColor = MagickColors.None;
                        imgShadow.Composite(imgMain, -1, -1, CompositeOperator.Over);

                    imgShadow.Composite(clone2, CompositeOperator.MinusDst);

                    //MagickImage clone3 = (MagickImage)imgShadow.Clone();
                    //imgShadow.Composite(clone1, CompositeOperator.DstOver);
                    //imgShadow.Composite(imgMain, CompositeOperator.CopyAlpha);
                    //clone3.Composite(imgShadow, CompositeOperator.Over);
                    background.Composite(imgShadow, Gravity.Center, CompositeOperator.Over);
                    background.Write((targetpath + "7fffd4" + "00FF00" + singleFont.SystemFontName.Replace(".ttf", "") + imageDetails.ImageCode + ".jpg").Replace("#", ""));
                }
                else
                {
                    
                    sparseColorArgs[0] = new SparseColorArg(0, 0, new MagickColor("#7fffd4"));
                    if (gradient_horizontal)
                        sparseColorArgs[1] = new SparseColorArg(imgMain.Width - 1, 0, new MagickColor("#00FF00"));
                    else if (gradient_vertical)
                        sparseColorArgs[1] = new SparseColorArg(0, imgMain.Height - 1, new MagickColor("#00FF00"));


                    clone1.SparseColor(SparseColorMethod.Barycentric, sparseColorArgs);

                    MagickImage clone2 = (MagickImage)imgMain.Clone();
                    clone2.Alpha(AlphaOption.Transparent);

                    MagickImage clone3 = (MagickImage)clone2.Clone();
                    clone2.Composite(clone1, CompositeOperator.DstOver);
                    clone2.Composite(imgMain, CompositeOperator.CopyAlpha);
                    clone3.Composite(clone2, CompositeOperator.Over);
                    background.Composite(clone3, Gravity.Center, CompositeOperator.Over);
                    background.Write((targetpath + "7fffd4" + "00FF00" + singleFont.SystemFontName.Replace(".ttf", "") + imageDetails.ImageCode + ".jpg").Replace("#", ""));
                }
                objectadd.localurl = (targetpath.Replace(ConfigurationManager.AppSettings["targetpath"], "http://localhost/ImageRepo/").Replace("\\", "/") + "#7fffd4" + "#00FF00" + singleFont.SystemFontName.Replace(".ttf", "") + imageDetails.ImageCode + ".jpg").Replace("#", "");

            }

The else part of the above code is working absolutely fine as suggested by you earlier
We are trying to achieve the effect of having the text get overlaid in an arc but we are stuck. The 2 images below show what we have achieved vs what we want to achieve.

Output of using Magick.NET

Output of using ImageMagick Command

dlemstra Dec 8, 2020
Maintainer

Where is your input image and what is the ImageMagick command that you executed for this last image?

Nihaarn1997 Dec 9, 2020
Author

There is no input image as such. The system we have developed will first create a .png file with the overlaying text using the Convert Command of ImageMagick. The system will then pick up a random image from the repository and overlay the generated png text file on top of it using the Composite command.

The ImageMagick command is similar to the one we have provided earlier (November 11). The system just changes the parameters of that command based on which image has been selected from the repository and the length of the text that needs to be overlaid. Below is an example of the ImageMagick command being used.

convert -size widthxheight -background none -font "PathToFontFile" -gravity center caption:"Bledisloe Cup" ( +clone -sparse-color Barycentric "0, %h #070504 %w,0 #000000" ) -compose In -composite -virtual-pixel transparent -distort arc 80 ( +clone -background none -shadow 100x2+4+4 ) +swap -background none -compose over -layers merge +repage "PathToLocation"

We are trying to convert this command to Magick.NET code and that's where we are stuck. From your previous answers we were able to achieve the gradient color effect for the text but we aren't able to get that same text in an arc (angle specified in the command). We tried using the Distort method but as you can see, the output was not satisfactory.

dlemstra Dec 9, 2020
Maintainer

I don't understand your issue. Please provide me with the following this:

input image
imagemagick command
output of the imagemagick command
magick.net code
output of the magick.net code

Nihaarn1997 Dec 9, 2020
Author

Hi please find an example of how we use the ImageMagick commands to generate the desired output.

Example contains overlay image, background image, final image and the command which is shown below

convert -background none -fill #f9f9fa -font "C:\Users\gnmumhelp\Downloads\SysFonts\LeagueGothic-Regular.ttf" -size 1536x864 -gravity center caption:"Bledisloe Cup" ( +clone -sparse-color Barycentric "0, %h #f9f9fa %w,0 #cdff37" ) -compose In -composite -virtual-pixel transparent -distort arc 50 ( +clone -background none -shadow 100x2+4+4 ) +swap -background none -compose over -layers merge +repage "C:\Users\gnmumhelp\Downloads\ImageMagick\Overlay\ABledisloe CupOverlayH8#f9f9fa#cdff37LeagueGothic-Regular.png"

composite -gravity center "C:\Users\gnmumhelp\Downloads\ImageMagick\Overlay\ABledisloe CupOverlayH8#f9f9fa#cdff37LeagueGothic-Regular.png" C:\Users\gnmumhelp\Downloads\BackgroundRepo\Sport\Rugby\Dark\2SportRugbyH8Dark.jpg "C:\Images\30000000549780901\gradient\f9f9facdff37LeagueGothic-RegularH8A.jpg"

Below is the Overlay Image

This is the background image

And this is the final output image

For your reference, the below image describes the functionality of our system in brief

For the Magick.NET code and the output of the Magick.NET code, please refer below

        MagickReadSettings settings = new MagickReadSettings();
        settings.BackgroundColor = MagickColors.None;
        settings.FillColor = new MagickColor("#f9f9fa");
        settings.Font = "C:\\Users\\gnmumhelp\\Downloads\\SysFonts\\LeagueGothic-Regular.ttf";
        settings.Width = 1536;
        settings.Height = 864;
        settings.TextGravity = Gravity.Center;

        MagickImage background = new MagickImage("C:\\Users\\gnmumhelp\\Downloads\\BackgroundRepo\\Sport\\Rugby\\Dark\\2SportRugbyH8Dark.jpg");

        MagickImage imgMain = new MagickImage(MagickColors.None, 1536, 864);
        imgMain.ColorFuzz = new Percentage(100);
        imgMain.Transparent(MagickColors.White);
        imgMain.Read("caption:" + "Bledisloe Cup", settings);
        imgMain.Composite(imgMain, Gravity.Center, CompositeOperator.Over);

        MagickImage clone1 = (MagickImage)imgMain.Clone();
        clone1.Alpha(AlphaOption.Opaque);
        SparseColorArg[] sparseColorArgs = new SparseColorArg[2];
        sparseColorArgs[0] = new SparseColorArg(0, imgMain.Height, new MagickColor("#f9f9fa"));
        sparseColorArgs[1] = new SparseColorArg(imgMain.Width, 0, new MagickColor("#cdff37"));
        clone1.SparseColor(SparseColorMethod.Barycentric, sparseColorArgs);
        MagickImage clone2 = (MagickImage)imgMain.Clone();
        clone2.VirtualPixelMethod = VirtualPixelMethod.Transparent;
        clone2.Distort(DistortMethod.Arc, 50);

        MagickImage imgShadow = (MagickImage)imgMain.Clone();
        imgShadow.Shadow(5, 5, 3, (Percentage)50);
        imgShadow.BackgroundColor = MagickColors.None;
        imgShadow.Composite(imgMain, -1, -1, CompositeOperator.Over);

        imgShadow.Composite(clone2, CompositeOperator.MinusDst);

        //MagickImage clone3 = (MagickImage)imgShadow.Clone();
        //imgShadow.Composite(clone1, CompositeOperator.DstOver);
        //imgShadow.Composite(imgMain, CompositeOperator.CopyAlpha);
        //clone3.Composite(imgShadow, CompositeOperator.Over);
        background.Composite(imgShadow, Gravity.Center, CompositeOperator.Over);
        background.Write("C:\\Images\\30000000549780901\\gradient\\" + "f9f9fa" + "cdff37" + "LeagueGothic-Regular" + "H8A" + ".jpg");

And below is the output of the above code

dlemstra · 2020-12-14T22:29:03Z

dlemstra
Dec 14, 2020
Maintainer

Your commands could be translated to this:

var settings = new MagickReadSettings
{
    BackgroundColor = MagickColors.None, // -background none
    FillColor = new MagickColor("#f9f9fa"), // -fill #f9f9fa
    Font = "LeagueGothic-Regular.otf", // -font "LeagueGothic-Regular.otf"
    Width = 1536,
    Height = 864, // -size 1536x864
    TextGravity = Gravity.Center, // -gravity center
};

using (var caption = new MagickImage("caption:Bledisloe Cup", settings))
{
    using (var sparseColorImage = caption.Clone()) // +clone
    {
        var sparseColorArgs = new SparseColorArg[2];
        sparseColorArgs[0] = new SparseColorArg(0, caption.Height, new MagickColor("#f9f9fa")); // 0, %h #f9f9fa
        sparseColorArgs[1] = new SparseColorArg(caption.Width, 0, new MagickColor("#cdff37")); // %w,0 #cdff37

        sparseColorImage.SparseColor(SparseColorMethod.Barycentric, sparseColorArgs); // -sparse - color Barycentric

        caption.Composite(sparseColorImage, CompositeOperator.In); // -compose In -composite
    }

    caption.VirtualPixelMethod = VirtualPixelMethod.Transparent; // -virtual-pixel
    caption.Distort(DistortMethod.Arc, 50); // -distort arc 50

    using (var overlay = caption.Clone()) // +clone
    {
        // not sure why this needs to be black instead of none.
        overlay.BackgroundColor = MagickColors.Black;
        overlay.Shadow(4, 4, 2, new Percentage(100)); // -shadow 100x2+4+4

        // Easier than -compose over -layers merge
        overlay.Composite(caption, CompositeOperator.Over);

        using (var background = new MagickImage("background.jpg"))
        {
            // composite -gravity center
            background.Composite(overlay, Gravity.Center, CompositeOperator.Over);
            background.Write("a.jpg");
        }
    }
}

1 reply

Nihaarn1997 Dec 15, 2020
Author

The above code worked perfectly and generated the output image as required.
Thanks a lot for all the help you've provided over the past couple of weeks.
Cheers!

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Gradient Caption Magick.NET #781

Nihaarn1997 Nov 10, 2020

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