Background images are floating on the page according to mouse movement. What i want is that whenever there is an image behind/above the text the color of that specific portion of text get's change similar to given image.
I had tried multiple libraries like Frame-motion, GSAP but I am unable find the solution. If there is kindly let me know.
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I exported a bunch of png files from R. The pictures are of a dataset that is 'spinning' against a white background. I then use GIMP to stitch them together and export an animated gif. Unfortunately, the gif has a yellowish color instead of a white background like the original files. This yellowish color was not there when I used to do this in imageMagick and isn't even there when I preview the files in GIMP. It only appears after I do the export as a gif. Does anybody know what is going on and how I can correct this?
GIF files are limited to 255 colors. If you don't downsacle colros prior to exporting them, GIMP will do that automatically at the export step itself. It is at this point that your yellowish background is being created.
The workaround is quite simple: convert your image to the indexed color model before exporting the GIF file (image->mode->indexed) ( perceive you could even force a custom crafted palette at this step). If after this conversion the backgroound is already yellowish, you can manually redefine it on the Color Map dialog (search for it on the Windows->Dockable menu) - pick the background color, and change it for white.
When exporting the Indexed image to an animated GIF there is no color conversion step, and the colors of the GIF are saved as they are seen on the screen
The issue here is GIMP is trying to do its best to convert your image down to 255 colors, and that is where it is failing. What I recommend for people on OSX is to get this program called ImageAlpha (it is free) https://pngmini.com/. It does a very good job and compressing png images without much loss. If anybody has a recommendation for a Windows app that would do this, please post it here for reference.
There might be duplicates of this question but I didnt find any exact solution to my problem.
I have an image. The source of image is a png image named add.png. The shape of add.png is like a plus(+) symbol. Its color is white at the moment.
I want to change this white color to green when mouse cursor goes over it. So which property of the image should I change to change its color.
I don't want to change the source of image.
Edit :
Why I don't want to change the image source :
Basically I have a rectangle and I keep the image over it.
On MouseOver and MouseLeave I change the Fill color of Rectangle using ChangePropertyAction. Now When I click on the image I want to change its source.
But when my program runs I get an error sayin that windows explorer has stopped working.
When I see the output window for errors I get System.NullReferenceException: Object reference not set to an instance of an object
It is easier. to change the image source.
Your options are limited here: Create own effect by derive from System.Windows.Media.Effects.Effect, call it ColorEffect and implement color change logic there, a similar alternative would be to create separate PixelShader Effect but this is more complex then the Effect above.
Use image processing from http://www.codeproject.com/Articles/237226/Image-Processing-is-done-using-WPF
Does anyone know what the background colour is for the jetpack theme??
http://www.silverlight.net/content/samples/sl4/themes/jetpack.html
We're using the theme, but I can't see that light silver background colour which has a gradient through it.
Actually if you create a new project based on the JetPack theme, you will see there is a user control called TiledBackground which does the repeating effect for you.
However, the dependency property ResourceUri of this user control is binding to a wrong image file by default, I believe, and that's why you only see a light colored background.
To have the same background as in the demo, you simply need to replace the image backgroundtexture.png in the Images folder with the image file that Joe has provided. Then in the MainPage.xaml, you need to make sure the SourceUri is binding to this image.
For example, I have replaced with Joe's image and still named it backgroundtexture.png, and my project name is JetPack.
<controls:TiledBackground SourceUri="/JetPack;component/Images/backgroundtexture.png" />
Then you should see the dark background as expected. :)
It's actually an image that is repeated. To get the same effect you'll have to write a custom control or effect that tiles the image. Here's the image.
And here's a sample of tiling an image.
http://nokola.com/blog/post/2009/12/22/Fast-Tile-Brush-in-Silverlight-And-Easiest-Way-to-Shader-Effects.aspx
An Icon can contain more than one image. I want to use an icon for an ImageBrush and I want to set which image inside the icon should be use. But somehow it seems I can't do that. The brush always picks the largest image from the icon.
Is there a way to choose the image manually?
In a Silverlight application I have large images which have flow charts on them.
I need to handle the clicks on specific hotspots of the image where the flow chart boxes are.
Since the flow charts will always be different, the information of where the hotspots has to be dynamic, e.g. in a list of coordinates.
I've found article like this one but don't need the detail of e.g. the outline of countries but just simple rectangle and circle areas.
I've also found articles where they talk about overlaying an HTML image map over the silverlight application, but it has to be easier than this.
What is the best way to handle clicks on specific areas of an image in silverlight?
Place the Image and a Canvas in a Grid so that the Canvas overlays the Image.
Add shapes of appropriate sizes and placed as needed to the canvas. All shapes will a transparent fill and no border, hence the user only sees the Image. On the Canvas MouseDown (or Up events) use OriginalSource to determine which shape generated the click. Use the Tag property of each shape to associate it with some object that represents the flowchart element being mapped.
I found an easy way to do this without a canvas:
How to get the coordinates of an image mouse click in the event handler?