Cool. Do you know if something similar is possible for SVG or VML?
/ Fredrik

No, I don't think it is. Would be neat if it was, though, then excanvas could be made saveable too.

Ok. I guess you could technically/theoretically write an SVG parser & renderer that outputted base64 ;)
/ Fredrik

SVG 1.1 requires UAs to support SVG in (x)HTML Image Element. There it is straightfoward to draw an SVG element onto a Canvas using CanvasContext.drawImage( SVGElement, 0, 0 );

Seeing how much SVG implementors choke on the spec and get it wrong, you probably don't want to implement your own interpreter ;)

Hi... Really cool stuff.... Do you think it's possible to define different brushes eg. from images or vector data?

@anon: Sure. The drawing part was just done for giggles and not to make a real drawing app, as this is more about saving images than drawing.
I'm sure there are better and nicer canvas paint applications out there.

If you combine this with http://fuchsia-design.com/CanvaSVG/, you effectively have a way to convert SVG to Canvas to Bitmap.

Example: http://antimatter15.110mb.com/misc/svg2bitmap/index.xhtml

@anon: Grafio's Artist's Sketchbook is a nice Canvas based drawing widget.

In OSX, when downloading these files, the suffix appended is .exe... which is kinda confusing for the user. Changing it to "image/octet-stream" seems to work. But maybe that's completely invalid.

@mud: Thanks, I'll try and change that.

What would be cool if you could somehow add this to a web-form and submit the image to the server... that would be possible not?

Just send the imagedata to the server... dman that would be cool. Users can add self-drawn-images instead of plain text. always funny

I only need a simple canvas-paint / editor now..

Couldn't you go one step further and perform the conversion on right mouse click, and then reset when the context menu is dismissed? Then you eliminate an extra step for the user, and it looks like you can saveAs a canvas.

Someone needs to put this image saving capability together with something like http://mynichecomputing.org/sharedDraw/ using mySQL database for storage and get a super modified version of this shared whiteboard program. Get your own copy of the complete kit of source code for this here: http://mynichecomputing.org/roughDrawKit.zip Let me know at lorlar AT gmail dot com if you do this just-proposed version

@lorlarz: Anyone is free to take the code and use it (it's MIT licensed) for whatever. I don't have time right now to work more on this, though.

so, can we save the canvas on a server directory (777)?

Hey,
I opened the canvas area in a popup. The pop-up size is 700 X 700 and the canvas dimensions are 600 X 300. When I use the mouse to draw inside the area, I'm not able to utilize the full height of the canvas. Also the mouse positions seems to be screwed up. Any idea? Do I have to modify the mouse event functions to so that mouse movements are captured correctly

is there any way to write the image to a file on the host server rather than have it open as a file download within the browser?`

Is there a way to get this to work with Chrome?

I'm able to save the image to a file on a server. How do I prevent users from saving a blank image(if they leave the canvas blank and save it)?

Has anyone tried posting the canvas image back to the server in a form?

@Oliver George:
It's very easy. I'm using jQuery to serialize the form input. Before sending the form input to the server(I'm using Ajax to do this ), I append the canvas image data to it.
This is how I'm doing it:
var formInput= jQuery("#ID_of_the_form").serialize();
// Now append canvas image-------
formInput+="&img="+oCanvas.toDataURL('image/jpeg');//saving in JPEG format

// This is the PHP Code------------
$image = str_replace(" ", "+", $_POST["img"]);
$data = substr($image, strpos($image, ","));

// Save the image to a file ------
$filename="myImage.jpg";
$file = fopen("Your/images/folder/".$fileName, "wb");
fwrite($file,base64_decode($data));
fclose($file);

Any joy with this?:

>> It would be really neat if somehow a filename could be attached to the data, but I've found no way to do that. For now, you have to specify the filename yourself. <<

is there any plan to make it work in chrome?

I use it for converting a graph ( with flot - jquery plugin).
I just use the png conversion, because others doesn't look good, which works for me in FF and Chrome, but not IE.
Would be nice if it would work in IE too. isn't it possible with the excanvas.js and some ie related fixes`?

Error: oScaledCanvas.toDataURL is not a function

Where is the toDataURL function defined. I keep getting this error and can't seem to crack it.

I also get the same error, tried opera 10.6 and ff 3.6.6, both with "PNG" and "JPEG"

Error: oScaledCanvas.toDataURL is not a function.

anyone has any clue ?

Hi !
I have win7 + Firefox 3.6.8. I'm testing the
Canvas2Image.saveAsPNG() function, and cannot find a Name for the PNG file. The function write a file with random name, and .part extension. Can anyone help ?

FF 3.6.8 here as well and getting the toDataURL is not a function.

Doesn't work on Chrome or Safari either. Did it get stealth nerfed for security issues or is the function inherently useless because the end user has to turn something on?

Can you add the ability to specify the default filename in javascript when you save?

I just would like to mention - this plugin will not work for a canvas on which was performed a drawImage(...) call, where the image was outside your domain.

In other words, if you needed to drawImage on your canvas, and this image was from another domain, you can't export your canvas to an image later.

This is 'thanks' to the same-origin policy and more specifically, the browser will prevent you from doing getImageData().

Does anybody know how to save only a particular part of the canvas, by modifying the file canvas2image.js or base64.js?... I don't need to save the whole thing

Any news about canvas behaviour and same-origin policy?
Did someone find a work around ?

Is there a way to specify the filename of the image before saving it locally?

Nice script, but please let it be noted that base64 libraries aren't needed.
Simply btoa and atob do just fine.

filename is always very long and contains random characters then .part

Hello,
I am not able to save on IPAD. It gives me prompt that Safari cannot download this file. Is there any solution to save canvas as image on Ipad ??

hii..I want to save image on usb..How can i achieve this??
please help

hi

Anyone know how to get the File to save a spesific file name or even just to make the default save as .jpeg or .PNG and not .part?

is it possible to make it work with the help of explorercanvas... because now it dont work with IE

Has anyone had any luck saving a WebGL canvas using this library?

can I use it in a gwt app?

The method doesn't seem to work on IE 9 (though most canvas-related operations I have used do). The statement

document.location.href = strData

in saveFile() generates the message

The data area passed to a system call is too small.

I think the problem is that IE doesn't support a URL over 2048 bytes long, as described in http://support.microsoft.com/kb/208427 .

I am not sure that there is a solution that still results in a direct download of the file. If you know of one, please let me know.

For the filename issue, add the download attribute to your \ tag. i.e. <a download="test.png" href="javascript:document.getElementById(<canvas_div_id>).toDataURL('image/png').replace(image/png);"

Simple as pie :)

hi,
so nice post....

Canvas prints are wrapped on 3/4" or 1 1/2" thick high quality wooden frames. We only use premium qaulity wood, for unsurpassed quality.

Canvas prints

it saves a file with no extension, and when i save it in my ipad my app file can't open it, how can i solve this??

Hi! I've been getting these "Security error" warnings on both Firefox and Chrome. Have any idea what this is about?
I was just doing a straight console.debug out of the canvas.toDataURL function

Hi! I've been getting these "Security error" warnings on both Firefox and Chrome. Have any idea what this is about?
I was just doing a straight console.debug out of the canvas.toDataURL function

amazing! thank you

Blog design is an important aspect to attract visitors.

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Hey there =)
Have an Issue with Androidphones
Everytime the finger leaves the touchscreen the script draws a line back to the centre of the field.
Apple just works fine.
Is it a known issue?

Hello,
thanks for that, nearly what i was looking for.

Does a background image on the canvas can be rendered in the png file generated ?

http://greenethumb.com/article/1429/user-friendly-image-saving-from-the-canvas/

That's the solution for the filename and .part problem I was looking for, maybe others will also be looking for something like that

When i click on save. I get a .part file not a jpg or png on all three save buttons.
Firefox 14

oh I see some has had the same problem already.
I'll check the link

I think, alpha channel saved with bugs for png format. (artefacts) Plaese check this version and correct.
Thx!

Thanks a lot man! I especially appreciate your effort to transform the image data to bitmap, this is very useful for mobile browsers that don't support toDataUrl (like android < 3.0). Danke!

Hi, please let me know how to initiate the download with JavaScript from canvas with a button as show in the example.

Thanks

Very appreciate yoru work, thanks.

Hi Jacob, really like this site, you've got some great knowledge here.

I've been trying to get this canvas2image to work, but it seems as though it wont save or download an image if you draw a png image into the canvas?

Has anyone else tried this? As I can't seem to get it to work.

exception inside

at this point:
// sends the generated file to the client
var saveFile = function(strData) {
document.location.href = strData;
}

My call:



function captureImage() {
var video = document.getElementById("Video1");
var ctx = document.getElementById('canvas').getContext('2d');
ctx.canvas.width = video.clientWidth;
ctx.canvas.height = video.clientHeight;
ctx.drawImage(video, 0, 0, 32, 32);

var oCanvas = document.getElementById("canvas");
Canvas2Image.saveAsPNG(oCanvas);
// will prompt the user to save the image as PNG.
}

I find canvaimage2 very importante and nice to quickly capture & save image from video, could you tell me please where is the problem in my last post. Than you

I think you can now get it to use a filename in Chrome at least.
http://updates.html5rocks.com/2011/08/Downloading-resources-in-HTML5-a-download

Hello Everyone,
I am facing problem in running this code, though I added both libraries (base64 and canvas2image) but still facing failure
anybody please provide me complete working source code of this example.
waqar.sign@gmail.com
Thanx in advance

This Canvas2Image library works fine with my laptop, but when I run it on my Android tablet, it just downloads a random file with .bin extension and when I try to open this file, it just fails to open. Can somebody tell me how I can accomplish this in Android devices?