I have some png vectors with transparent backgrounds that I want to color overlay on the fly, so users can choose a vector and then choose which color they want it from a picker.
Only stipulation is that they cant be masked with background colors, because multiple pngs will be loaded onto the same canvas and will need to overlap.
How exactly do I go about loading an image into a canvas and then overlaying it with a certain color?
Edit: I have found some info here and here ( - answer by Nathan ) which sort of work, but not in all browsers.
The second one especially as I need only the png itself to be overlayed, and the transparencey to stay transparent
Practically you want to load the image into canvas and overlay it with a certain color, that will give a color effect to the overall image.
This jQuery plugin does exactly that, it loads the image into canvas, manipulates the color giving the nice tinting effect and convert it back to image element. Converting this back into image element is a very important part, as some user may style their CSS base on img element, instead of ID or class.
Just play with the interactive demo:
and go through the docs:
Have fun.
Related
My app uses up to 6 svg images layered to create an interactive image. I have found that I cannot mouseclick on any images below the first.
** Edit. Excess code and text removed.
You can make an element insensitive for mouse events by setting the pointer-events attribute to none (see Tinkerbin):
svg > *{opacity:.5}
In essence I cannot do what I want this way. Stacking embedded images results in only the top layer being clickable by the mouse.
An image map works, with some mucking about.
I created a clear image calling it clearOverlay and gave is a usemap value tying it to my image map.
My imagemap I created using a free online app http://www.image-maps.com which took my image allowed me to create my clickable zones and generated the html for me. After cleaning it up and swapping the href values for onclick functions I added the map to my code.
Next problem was getting it to overlay my existing images. I eventually used style="position:relative; top:-300px" forcing it to sit squarely on my image. I'm sure there must be a better way, but at this point that worked for me.
For anyone else doing this don't forget to either place the clearOverlay last in your image list or set the css z-index to higher than everything else to make sure it is sitting on top.
So I now have a stacked svg image, where I can manipulate each svg according to where the user clicks. Its only taken me 5 days! I'm kinda over this coding by yourself lark.
** My image map above will not scale to different sized screens. The next time I try this, I will experiment using a transparent svg with fill zones where I wish to click.
Can someone tell me how I can present my users with a triangle over the background image. I want to make a triangular UI. For that I'm masking two images(one background.jpg and masking image, triangle.png). I'm using this new image in my a div's background. I have accomplished this using MaskImage.
But the problem is that the size of my background image changes but the size of triangle.png is fixed. I have also tried using linear-gradient, css property. but it is not working in IE. So is there any plugin which mask two images irrespective of there sizes. or any other optimal way to achieve my goal.
Thanks in advance :)
You should be able to overlay two masking triangles using :before and :after in CSS and create triangles using uneven border properties like http://css-tricks.com/snippets/css/css-triangle/.
Edit: http://jsfiddle.net/A9Zbj/11/ (Yay!)
I have a site where it has div tags with background colors, and I use relative positioning to move them all together so it looks like an image. I moved them so its exactly on the top left of the page.
How do I create an image out of it, so like if there was a button, when it gets clicked, it creates an image of width 608px and height 105px, and then asks the user if they want to save it or open it or close it (standard download box)?
I would need to get the pixel color starting from index (0,0) right?
Instead of using background images on divs, just draw images onto a canvas. Then take a look at this http://www.html5canvastutorials.com/advanced/html5-canvas-save-drawing-as-an-image/
Trying to find out if it's possible to 'shrink' an animated gif. Not in file size but in regard to the dimensions of the image.
If not, is there any way to catch the animation with jquery/javascript so I can shrink the size my moving the image out of view with css?
Or alternately after there any libraries out there for simple image manipulation type stuff for HTML5 Canvas?
EDIT:
The first mock up of the image is at http://swmohappening.info/. It's essentially a website that I'm doing to help out a local youth group retreat.
I'm wanting to shrink the portion of the letters that run-on so it's a more manageable banner to leave on the page. I do need to maintain the dimensions of the center/main section of the image.
Take a look at the animate function in jQuery - you can change the size of an image and specify the time that takes too.
As what I've read makes it seem as though the jquery animate will simply change the dimensions of an image (which isn't what is needed at the moment). I think I'll most likely end up using animate to move the image out of view to 'shrink' it that way...
I have an image with 5 logo's and I'd like each logo to change individually from greyscale to color on hover. The obvious solution is to chop the image into the separate logo's with each having both a greyscale and color version and then do a standard css rollover.
However, I can't increase the page load with 5 additional image hits. Is it possible to do this using jquery and one large sprite with all 5 logo's in both greyscale and color and somehow detect which area of the image is being hovered over so the associated color version can then be shown?
You don't want to fiddle with cursor location if you can avoid it. Actually, what you probably want to do is create a CSS sprite - it's one image file that contains all 10 logos (5 color, 5 greyscale). That way, the browser only has to load one image. Then, using CSS, you display pieaces of that image as the background image for your various elements, and vary which piece is displayed using the :hover pseudoclass.
This page will get you started:
http://www.w3schools.com/css/css_image_sprites.asp
And I like to use this page to create sprites and the CSS that goes with it.
http://spritegen.website-performance.org/
Note that this is a somewhat difficult technique to get working the first time, but it saves lots of time and bandwidth in the long run.