I was wondering if it was possible if I had an image like:
I would be able to change certain parts of the images colors. For example if I wanted the bow green and the present red with yellow stripes, would I have to make a new image that had that or is there a way to program something (elegantly) along the lines of that? I'm just asking to see if its possible and if it is, what language would be best to do this?
Keep in mind this would be a feature on a website.
That's not going to be easy the way the image is. You have no way to tell the computer which part is the bow, which part is the stripes, and which part is the box. However, if you pre-colored them, you could do a color replace using GD library or imagemagick pretty easily. You'd do this in PHP. Here are some examples of how you could do it, I'd personally go the imagemagick route.
How can I replace one color with another in a png 24 alpha transparent image with GD
http://www.imagemagick.org/Usage/color_basics/#replace
(this example even has a similar gift box as the usage case, hehe)
Try leaving the parts you want changable transparent. Then, give the div it's in a hover state with the second background color.
You could:
Use an indexed-color image and change the colors in the palette.
Use #MT's suggestion, though it kinda gets out of hand with multiple colors and jagged regions.
Pick control points and fill ("floodfill") the image through them - programmatic version of using the bucket tool.
Use #profitphp's suggestion, which is really better my last one.
Abandon compatibility and use the new canvas element while it still has the "cool" factor :)
i presume this is a web-based painting application; you'll require a human to tell you what the parts are, and where they want the coloring to be.
The issue then becomes how to perform a flood fill at the user's request.
The best i can suggest is perform the flood fill server-side, using an image processing library - handing back the image to the user:
There is no javascript ability to access pixel data of an image.
Edit: Performing flood fill with HTML Canvas
Related
I have an Italian map, and I need to color some regions programmatically.
This is the image:
As you can see there are few regions with a different color (orange).
I have a page where I need to highlight the areas of user, so I need to color those areas differently. The base is grey and the selected must be orange.
Now, How could I do it programmatically?
I would like to avoid creating one image for each user.
Any Ideas?
I still prefer creating "one image per user". It's actually not per user. Make your variations of the image already created, and load them by your server-side logic. I mean, something like sprites. Have every part both colorized and non-colorized.
Have you considered jQuery powered interactive maps like this one:
Link 1
Alternatively, if you get really stuck you could look at something like this (paid plugin!)
Link 2
I don't think php's GD or imagick libraries are so powerful, and if so, it won't be that easy to do, and the resulting image could lose quite a lot of quality, as the borders of the map are even antialiased.
I would suggest you to Google for "interactive maps", normally you have the vectorized images and use Javascript and CSS to achieve what you are trying to do. Maybe there are already something for Italy.
I want to have a map (which is image-mapped) show green in areas where some criteria applies, yellow in some other areas and red in other areas.
The goal is to display a clickable image which will will colour certain states which match certain criteria. I was previously considering flash but the owner simply doesn't want flash. One possible alternative would be to display 'clickable' coloured labels on the map but I don't know how to do this either. Does anyone know how I can solve this? Any help will be much appreciated. Thanks!
Check out Raphael: http://raphaeljs.com/
So this is what I finally did.
I found an svg map of Nigeria on wikipedia (which has the svg maps of
almost every country).
I downloaded InkScape and cut out the parts I didn't need from
the map.
I used the Raphael SVG to HTML Converter tool to convert it to
code usable by raphael.
From here it was quite very easy, I could use path.fill to 'colorify'
the image and it was easy to set different functions for clicking any
part. Scaling was also not an issue as the image could be scaled
dynamically based on the container.
Thanks to everyone especially Olle for pointing me in the right direction!
jQuery Vector Map http://jqvmap.com/
or
JVectorMap
JVectorMap comes with more pre-generated maps than jqvmap. But you should be able to generate your own.
Take a look at jQuery. PHP is not where you will do this, its going to be client side Javascript to manipulate an html image map using either overlay images or a change in CSS via the Javascript.
For what its worth, this can be done in php using the gd extensions. Essentially what you do is load an all white version of the image, and then using coordinates on the image, fill the image with a given color using imagefilltoborder (http://www.php.net/manual/en/function.imagefilltoborder.php) .
However, to make it clickable, you would need to use an image map or javascript on the clientside anyway.
I'm trying to figure out via PHP if I can do the following. Imagine I have a two images. The first is an image of a square (50px by 50px). The second image, is that exact same square, only offset by 5px to the left.
I'm wondering if there is a way to dynamically generate all the images in-between to make this a smooth looking image transition (ie in this case generate the other 4 images to make it look like it moved from left to right). This would be a pretty simple situation, however would be applied to more complex images with the exact same premises, essentially using two images to predict the mediums.
Thank you in advance for your help
php would only be a wrapper, think eval() and google it, like http://www.linuxfocus.org/English/September2001/article139.shtml
regards,
/t
I believe the best thing you could hope to do with PHP is to do a 'morph' animation, where you sample the pixels for the first image and the second image, then create a third image consisting of the average color values. Repeating this process you could create as many sub-frames as you would like, but the result would be a blurring / morphing of image A -> image B, and would only be perceived as an animation with the simplest of input images.
More complicated algorithms including edge-detection or hinted-shape tweening could be utilized and implemented, however PHP might not be the best choice for this.
You can dynamically create images with a combination of PHP and ImageMagick.
You can pass in each dimension to ImageMagick, and it will generate an image on the fly for you. Create an image for each pixel you offset, resulting (in this case) in four extra images you can use later for your animation.
is it possible to create this image in PHP using GD ? i know i need to use GD and imagecreate, imagecolorallocate, imagedestroy etc... but i have no idea how to do the curve
i need to create multiple arrows with these patterns
different type of arrows
different inclination of the curve
different colors
different length
edit: this way i don't have to look on the internet for arrows (based on a user/client specs). and then later i will add text to the image (for example: click next or follow the arrow). since im not a graphic designer, creating these iamges using gd will be easier for me.
eg:
http://kennebecvalleycoaching.com/red_arrow_curve.JPG
http://s3.amazonaws.com/satisfaction-production/s3_images/13664/curved_inline.png
thanks
Instead of doing it server side, you could investigate things like canvas, or raphael, and create the graphical elements clientside. It will be much more flexible, and less hassle.
I'm working on a web application that need to allow the user to drag and drop as well as rotate an image.
Drag and drop is solved with the jQuery UI Draggable.
But how am I suppose to rotate an image on the page? My images are mostly one colored rectangles. I used divs to draw them on the page but how to rotate them?
It is okay if they only rotate 22, 5-45-67, 5-90 degrees
So I think of 3 solutions
Using Canvas
Problem: IE support
Using divs
Problem: it also needs canvas to rotate
PHP GD
This solution is the only hope that left.
How it might work: The application will prerender (22,5*x) rotated versions of original image. So they will be ready whenever user wants to rotate an image.
Please help. Any suggestions appreciated
One possible solution is to use a JavaScript graphic vector library that can use automatically an alternative to canvas when used on IE.
Raphael is a really good one, give it a try:
http://raphaeljs.com/
You can find more informations about rotation with raphael here:
How do I rotate a div with Raphael.js?
take a look:
http://www.dyn-web.com/code/rotate_images/
Rotate image clockwise or anticlockwise inside a div using javascript
The server side method sounds a bit wasteful (all versions of the image need to be downloaded), dare I say you should try using Flash for a cross-browser and client side solution.
You cannot manipulate image directly with Javascript other than resizing them (and this is technivally done with CSS, not Javascript...). The best solution would be to use Raphaël; it will allow you to ratate, but also drag and drop, and it is also built using JQuery.
Of course you could alternately use different image states and use them as "sprites" for your rotated rectangles, however you will not play extensibility there. (GD is a bad design, don't use that.)