I am looking to build an app similar to santayourself (facebook application) a screenshot below
The application will accept a photo and then the users can move it with controls for zoom and rotate and moving image right, left, up and down. Then once the face is as required then the user can click save to save the image on the server (php, apache, linux).
Any recommendations on how to go about this project? I guess a javascript solution will be better. Any suggestions welcome.
javascript AND php GD-library would do it - most of the things described above can be done w javascript alone. The fastest way to do this would be to have the santa mask done w a transparent png absolutely placed over a simalarly placed client photo that is however placed in a div the same size as the mask with overflow set to hidden. Since the client phot is absolute within the div it can be moved around and its size can be manipulated by the user through some mechanism as shown above. However - rotation will be a bitch and here you will have to use php gd-library or image majik (personally i would dump rotation). This is a simple-ish job but time consuming - the user-interface to image manipulation is tricky tho. If the output for this is for print-from-screen i would not bother w further server-side manipulation, but rather just store the image to mask positional relationship (1/2 kb) of data...
yep. javascript is the way to go about interactive things like this. I can see this easily being done with a simple script and some PNGs (though you might have to do something creative for the rotation). PHP would only be needed for saving.
EDIT: Actually, now that I think of it, a HTML 5 canvas approach would be best. It's got lots of transformation and pixel-manipulation methods, and can even save the image client-side! Remember, though that HTML 5 is not supported in all browsers (basically everything except IE).
(HTML 5 Canvas Spec)
The drawImage method is what you're looking for:
(I quote from spec)
void drawImage(in HTMLImageElement image, in float dx, in float dy, in optional float dw, in float dh);
So, your HTML would have a canvas element that draws the user's picture:
<canvas id="canvasElement" width="xx px" height="xx px">
<!-- What to display in browsers that don't support canvas -->
<p>Your browser doesn't support canvas</p>
</canvas>
Then, your javascript:
var view;
var context;
var userPhoto=new Image;
userPhoto.src="uploaded.jpg";
// Update these with UI settings
var position = {x:x, y:y};
var scale;
var rotation;
function init() {
// Run this once at the loading of your page
view = document.getElementById("canvasElement");
context = view.getContext("2d");
}
function update() {
// Run this every time you want the picture size, position, rotation updated
context.clearRect(0, 0, view.width, view.height);
// Scale X and Y
context.scale( scale, scale );
// Rotate (convert degrees to radians)
context.rotate( rotation / 3.14159 * 180 )
// Draw the image at X and Y
context.drawImage( userPhoto, position.x, position.y )
}
HTML 5 Canvas is very powerful, so there's tons of other things you can do to your image if you go this direction. However, another viable solution would be to use flash, which is supported everywhere — but I recommend HTML 5 as it is the way of the future (Steve Jobs: Thoughts on Flash).
Have a look at the jCrop library (jQuery), you may be able to tweak it enough to do what you want to do.
http://deepliquid.com/content/Jcrop.html (they obviously supply a few demos)
Related
I've a very strange requirement, I've an image(Image has slight gradient effect) which center portion need to be shown with the color change with the user score
colour 255,255,0 for High Score and 155,155,55 for Low Score
Now I want to know which way should I do it, I tried it with the HTML5 Canvas but that wouldn't work with the IE, so I'm discarding this option
I don't know it can be done with the css or not
Or with the GD lib using PHP
HERE is the image
http://i47.tinypic.com/b88l13.png
Thanks
I have developed several projects using the Processing.js library and I fell in love with it. If you want you can try it, you could do what you asked in a few lines using
http://processingjs.org/reference/tint_/ .
PImage b;
b = loadImage("http://i47.tinypic.com/b88l13.png");
void setup(){
size(200,200);
}
void draw(){
tint(255, 0, 0);
image(b, 0, 0);
}
You may want to split the colored (pyramid) part from the background and only tint that part.
Note that in the demo I have used the Base64 version of that image to avoid cross-domain policy issues.
DEMO: http://jsfiddle.net/CrUja/
It works in IE9 and I think you can make it work in IE8 using http://code.google.com/p/explorercanvas/ (or maybe Processing.js already has this integrated)
I'm building a site that depends on bookmarklets. These bookmarklets pull the URL and a couple of other elements. However, I need to select 1 image from the page the user bookmarks. Currently I'm trying to use the PHP Simple HTML DOM Parser http://simplehtmldom.sourceforge.net/
It pulls the HTML as expected, and returns the tags as expected. However, I want to take this a step further and only return images with a min width of 40px. I know about the function getimagesize() but from what I understand, this is resource heavy. Is there a better method available to pre-process the image and achieve the results I'm looking for?
Thanks!
First check if the image HTML tag has a width attribute. If it's above 40, skip over it. As Matthew mentioned, it will get false positives where people sized down a large image to 40px wide, but that's no big deal; the point of this step is to quickly weed out the first dozen or so images that are obviously too big.
Once the script catches an image that SAYS it's under 40px wide, check the header information to deduce a general width based on the size of the file. This is faster than getimagesize because you don't have to download the image to get the info.
function get_image_kb($path) {
$headers = get_headers($path);
$len = explode(" ",$headers[6]);
return $len[1];
}
$imageKb = get_image_kb('test1.jpg');
// I'm going to gander 40x80 is about 2000kb
$cutoffSize = 2000;
if ($imageKb < $cutoffSize) {
// this is the one!
}
else {
// it was a phoney, keep scraping
}
Setting it at 2000kb will also let through images that are 100x30, which isn't good.
However, at this point, you've weeded out most of the huge 800kb files that would really slow you down, and because we know it's under 2kb, it's not too taxing to test this one with getimagesize() to get an accurate width.
You can tweak the process depending on how picky you are for the 40px mark, as usual higher accuracy takes more time, and vice versa.
On my server, I have three files per image.
A thumbnail file, which is cropped to 128 by 128.
A small file, which I aspect fit to a max of 160 by 240.
A large file, which I aspect fit to a max of 960 by 540.
My method for returning these URLs to three20's gallery looks like this:
- (NSString*)URLForVersion:(TTPhotoVersion)version {
switch (version) {
case TTPhotoVersionLarge:
return _urlLarge;
case TTPhotoVersionMedium:
return _urlSmall;
case TTPhotoVersionSmall:
return _urlSmall;
case TTPhotoVersionThumbnail:
return _urlThumb;
default:
return nil;
}
}
After having logged when these various values are called, the following happens:
When the thumbnail page loads, only thumbnails are called (as expected)
When an image is tapped, the thumbnail appears, and not the small image.
After that thumbnail appears, the large image is loaded directly (without the small image being displayed).
What I desire to happen is the following
This is the same (thumbnails load as expected on the main page)
When the image is tapped, the small image is loaded first
Then after that, the large image is loaded.
Or, the following
Thumbnails
Straight to large image.
The problem with the thumb, is that I crop it so it is a square.
This means that when a thumbnail image is displayed in the main viewer (after thumb was tapped), it is oversized, and when the large image loads, it immediately scales down to fit.
That looks really bad, and to me, it would make far more sense if it loaded the thumbs in the thumbnail view, and then the small image followed by the large image in the detail view.
Does anyone have any suggestions on how to fix this?
Is the best way simply to make the thumbs the same aspect ratio?
I would appreciate any advice on this issue
Looking at the three20 source I can see that TTPhotoView loads the preview image using the following logic:
- (BOOL)loadPreview:(BOOL)fromNetwork {
if (![self loadVersion:TTPhotoVersionLarge fromNetwork:NO]) {
if (![self loadVersion:TTPhotoVersionSmall fromNetwork:NO]) {
if (![self loadVersion:TTPhotoVersionThumbnail fromNetwork:fromNetwork]) {
return NO;
}
}
}
return YES;
}
The problem is that as your small image is on the server and not locally the code skips the image and uses the Thumbnail for the preview.
I would suggest that your best solution would be to edit the thumbnails so that they have the same aspect ratio as the large images. This is what the developer of this class seems to have expected!
I think you have three ways to go here:
modify the actual loadPreview implementation from TTPhotoView so that it implements the logic you want (i.e., allowing loading the small version from the network);
subclass TTPhotoView and override loadPreview to the same effect as above;
pre-cache the small versions of your photos; i.e, modify/subclass TTThumbView so that when TTPhotoVersionThumbnail is set, it pre-caches the TTPhotoVersionSmall version; in this case, being the image already present locally, loadPreview will find it without needing to go out for the network; as an aside, you might do the pre-caching at any time that you see fit for your app; to pre-cache the image you would create a TTButton with the proper URL (this will both deal with the TTURLRequest and the cache for you);
otherwise, you could do the crop on-the-fly from the small version to the thumbnail version by using this UIImage category; in this case you should also tweak the way your TTThumbView is drawn by overriding its imageForCurrentState method so that the cropping is applied when necessary. Again, either you modify directly TTThumbView or you subclass it; alternatively, you can define layoutSubviews in your photo view controller and modify there each of the TTThumbViews you have:
- (void)layoutSubviews {
[super layoutSubviews];
for (NSInteger i = 0; i < _thumbViews.count; ++i) {
TTThumbView* tv = [_thumbViews objectAtIndex:i];
[tv contentForCurrentState].image = <cropped image>;
If you prefer not using the private method contentForCurrentState, you could simply do:
[tv addSubview:<cropped image>];
As you can see, each option will have its pros and cons; 1 and 2 are the easiest to implement, but the small version will be loaded from the network so it could add some delay; the same holds true for 4, although the approach is different; 3 gives you the most responsive implementation (no additional delay from the network, since you pre-cache), but it is possibly the most complex solution to implement (either you download the image and cache it yourself, or use TTButton to do that for you, which is kind of not very "clean").
Anyway, hope it helps.
I use Soundcloud for my tracks.
I'm using their jquery player to place a widget on my new site, as you can see on the top right:
The problem is, the waveform Souncloud provides is a one colour only deal:
My goal: To change this waveform PNG from curent colour to black, but client side.
I know I can change things using PHPs GD library, and I've done this successfully with a test image on my server using this code:
http://php.net/manual/en/function.imagefilter.php
(Search for "IMG_FILTER_BRIGHTNESS")
<?php
$im = imagecreatefrompng('hello.png');
if($im && imagefilter($im, IMG_FILTER_BRIGHTNESS, -255))
{
echo 'Image brightness changed.';
imagepng($im, 'hello.png');
imagedestroy($im);
}
else
{
echo 'Image brightness change failed.';
}
?>
It works perfectly! BUT
It changes the actual image on my server! Pretty cool, but not possible...
Obviously I cant change the image on Soundcloud's server (all the data, images, music comes from there API)
So What I'm looking for is a way were I can change the colour of the PNG client side, on the fly. I have a lot of tracks on there, so basically each time the user clicks next or previous, the waveform loads in and before it does it needs to change that image's colour :-?
Is this possible?
To see the player in action on my test site
(the styling on that one is old, by the way, but it's functionality is correct)
http://marckremers.com/2011/
NB the entire site does not work beyond what you see there. Still a WIP.
Thanks so much
This would have to be done client-side using Javascript, either a fully JS solution or one that uses AJAX to send it to PHP, then receives the final image.
You can try the Pixastic JS library:
http://www.pixastic.com/lib/docs/#intro
If that doesn't work, I would use jQuery to read the image, send it to a PHP script using JSRS/AJAX and then replace it on the page.
I am working on a new site and would like it to be able to add effects to photos uploaded. (Blur, Pan, Swirl, Sparkle, Border, Frames, etc ) I would like the photo manipulation to be in PHP if possible. I need the user to be able to upload the photo, make the edits, then save the edited photo to their computer.
This may be better as a separate question, but if at all possible I would also like the user to be able to save the edited image as their Facebook profile image.
Try PHP extensions for ImageMagick It's a standard, tried and true image manipulation library.
From the homepage:
Use ImageMagick to translate, flip,
mirror, rotate, scale, shear and
transform images, adjust image colors,
apply various special effects, or draw
text, lines, polygons, ellipses and
Bézier curves.
If you consider using the MagickWand PHP extension:
The MagicWand docs start off with a nice PHP code sample shown here:
<?php
$magick_wand=NewMagickWand();
MagickReadImage($magick_wand,'rose.jpg');
$drawing_wand=NewDrawingWand();
DrawSetFont($drawing_wand,"/usr/share/fonts/bitstream-vera/Vera.ttf");
DrawSetFontSize($drawing_wand,20);
DrawSetGravity($drawing_wand,MW_CenterGravity);
$pixel_wand=NewPixelWand();
PixelSetColor($pixel_wand,"white");
DrawSetFillColor($drawing_wand,$pixel_wand);
if (MagickAnnotateImage($magick_wand,$drawing_wand,0,0,0,"Rose") != 0)
{
MagickEchoImageBlob( $magick_wand );
}
else
{
echo MagickGetExceptionString($magick_wand);
}
?>
Similarily, documentation for things you seek:
blur
swirl
frame
magnify
and a plethora of others.... On that the main documentation page see all methods listed by searching for the heading: "MagickWand For PHP Methods".