I need a javascript library for manipulating/processing images. Not inside DOM, but similar like GDI+ where I can pick an image from file system and manipulate it programatically (get pixel color, change pixel color, add shapes and text , etc..).
I searched goolge but couldn't find such library. So far the best thing I could only find is a library called jimp, but it seems very basic and high level.
Does Javascript have such capability? reading an image and extracting information from it?
Related
I would like to know the best web technology/js library to achieve this functionality. I need to change the colors of specific objects inside an image. I need to develop a tool where they can choose a color and the objects inside the image will turn into that color.
This is a very close example of what I need. I've been reading about canvas but I haven't been able to find anything close.
www.msistone.com/virtual-kitchen-designer
Thanks in advance!
There are no magic or elaborated algorithm on it. They simply are using some PNG images and then they put the style tiles images before, so it looks like a texture changed or like if they uses a filter. You can realize of how it works watching the source code
The simplest way to target specific objects ( wall tiles, tables, floors, etc. ) within an image is in post production with an image editing application such as Photoshop, Artweaver, Paint.net, Inkscape, etc. and switch out images upon user selection using CSS or JavaScript. You replace the entire image this way and the minor changes show through when the image is switched.
If you don't want to do this manually there is no easy programmatic approach. For more information on coding applications to recognize objects look into machine learning and shape recognition algorithms but I suspect that is beyond the scope of a simple web app.
I found a lot of resources about my question, but I'd just like opinions based off of a high level overview of what I'm trying to do.
Basically, I'm using a combination of Javascript, and HTML to build a customizer for a friends' website. I should start by saying that I have some HTML experience but this is the first time I'm using Javascript (I am experienced with Java). The ultimate goal will be something like a customizer to allow users to select the parts of a bicycle and change their colors to place custom orders.
I've got the various parts of the bike as images files, and I'm using this jscolor color picker found at: http://jscolor.com/examples/#example-showing-hiding to allow the user to select a color from the color map. My plan is to layer a given part (photo) on top of a copy of the same photo, and fill only one of them, like layering in Photoshop. This way, the part fills in the correct shape, instead of filling as an entire square of the image file. As the cursor moves, the color should change in realtime. Once done, they can save the part and the color record will be kept on the back-end.
As I'm new to Javascript and not that experienced with HTML, I'm finding it a bit challenging to get this on the right track. So I'm hoping for some advice from some people who are experienced with HTML/Javascript/CSS to point me in the right direction to get this going along a better track than it is currently. I wasn't sure how to "phrase" what I'm trying to do.
The three main parts I'm addressing:
Using HTML buttons to load a different bike part (essentially load a separate image file).
Adding the color from the jscolor picker to the image of the selected part.
Saving the state of the part when the user clicks a Save button.
I will continue to search the forums as I already saw a few leads similar to what I want to do, but I mostly want to know if my approach seems feasible for what I'm attempting to do.
Thanks in advance!
Using normal HTML buttons will make things complex for you.
I think leveraging HTML5 Canvas API is a better way to approach this problem. Canvas is the HTML5 element for helping out you do the graphics manipulations using JavaScript. Learn more about canvas here.
You can make use of a library such as Fabric.js to make things easier.
I'm searching for a way to cut out any shape from an image and save it somewhere on the server.
I'm looking for solutions in PHP and/or JavaScript but haven't found anything yet.
I'm not sure but as far as I know the gd-library in PHP is only capable of cutting out or copying rectangular shapes from source images.
In JavaScript this probably can be achieved somehow through the canvas-object but I haven't found any libraries that provide such a function (rafael.js or paper.js don't seem to do the job) ...
Example:
Let's say i got the following image:
Now I would like to mark a certain part of that image (by x/y-coordinates):
And finally i want to extract that part as a single image (with the rest of the background beeing filled black):
Thank you for any help
Using PHP only, imagecopy lets you easily copy a part of an image by coordinates and do with it as you wish.
Edit: Using Imagick it's possible to crop images to specific shapes among other functions.
This is a pretty general question but just looking for someone to get me started in the right direction. I have been given a project where I need to create maps on a webpage and have certain parts of them highlighted/outlined on mouseover.
The maps I was given are illustrator files and when I open them up I see they are divided into the areas that I will need to highlight. Do I get those paths from AI and use them with something like Raphaël? Or do I create some overlays? Really not sure how to get started here.
Illustrator lets you export as svg. you can then use the svg as a background image, or include it inline in your page.
Note that you dont necessarily need to keep it in vector format in order to use it on a webpage. You could also simply use illustrator's "Save for web" feature to export the graphics as a png or gif.
Either way you can then start working with it like any normal web resource to build your page.
I'm trying to understand what people use canvas for?
I see it on job postings I read about it in Definitive JavaScript, but I don't quite get what it is used for.
I understand that you can draw 2d or 3d ( usually 2d ) objects but why no just use Gimp or Photoshop and upload the image.
Is it so you can create dynamic images based on say...user-specific data?
What is a practical example or perhaps a link to a professional implementation of canvas ( Definite JavaScript show basis stuff like drawing circles ).
MDN Tutorial
I have used a canvas to draw a graph, and it falls back to requesting a PHP-generated image if the browser doesn't support <canvas>. It's always a good idea to delegate processing from the server to the client, as this places less load on the server. In other words, instead of the server going "here's the stuff", it's more like "here's the data and the instructions to show it".
Another use I've seen is to highlight areas of an imagemap when moused over.
<canvas> is central in HTML5 game development, since it is used to draw the entire game viewport. Without it, there is no game.
Is it so you can create dynamic images based on say...user-specific data?
Yes
We used <canvas> to build interactive design editor for apparel in our e-commerce store — http://printio.ru/tees/new
The kind of interactivity we provide was only possible with Flash until recently.
Even on back end, we use Node.js and <canvas>-based image processing+generation to take data from online editor and create designs that are later used in store. These canvas-generated designs are eventually printed out on tshirts, mugs, caps, bags, and so on.
I think that's a pretty practical example :)
This is all done via Fabric.js canvas library (developed by us as well).
<canvas> is used for better Performance. <canvas> is much more faster and dynamic than jpeg or anything else. Example: http://www.profistart.com/internetseiten.html here was <canvas> used for Background.