I want to optimize a JPG image (lossless compression) to satisfy Google Page Speed, but I do not want to use this function:
exec("someBashCommand")
Every script that I found uses this function, but it is banned on my server.
Is it possible to do with pure PHP?
You can use ImageMagick with PHP, like this:
<?php
$img = new Imagick("image.jpg");
$img->setImageCompression (imagick::COMPRESSION_LOSSLESSJPEG);
$img->writeImage('result.jpg');
?>
but I have no idea how it is likely to help optimise anything if you are not prepared to allow some degree of quality tradeoff for size.
You could install the PageSpeed Module on your server:
https://developers.google.com/speed/pagespeed/module
but I am afraid that's also banned on your server.
But know that you don't have to optimize images ON your server, you can do it BEFORE you upload the images to the server. The only exception would be images uploaded by users of your website.
Use any image program with enough options for saving images to imitate what Google wants you to do. There's nothing mysterious about it, it can all be done in normal software. For instance:
http://www.practicalecommerce.com/articles/71090-15-Tools-to-Optimize-Ecommerce-Images
But remember these packages may not satisfy Googles demands.
Do not overdo this. Google shows you the best possible optimization, according to the rules they set, but your site will work fine even if Google thinks it could be slightly better.
Related
I'm looking for a tool to facilitate mulitple webpage file uploads from a single file browse dialogue. I know this has been asked previously, but I can't find anything current.
I'd like to check file size prior to upload, and I gather Flash is still the only way to do that cross-browser?
Ideally, I'd like an upload progress metre. I'll be using Linux and Apache servers, but don't have access to install add-ons such as PHP APC. Again, I assume something flash-based is the only option there?
I've looked at SWFUpload, but that appears to be another of these projects where the developers have become quite zealous and turned a simple concept into a full suite of tools for the masses. It seems quite cumbersome and I don't think I want to use it for my purpose.
I'd prefer not to have to write something from scratch for this. Could someone recommend me something or perhaps suggest a non-Flash alternative if there is one? I do need full cross-browser compatibility without too many layers of degradation, so anything HTML 5 probably isn't what I want.
Thanks
As I mentioned earlier today ( Multiple file upload (client side) )
I am a big fan of Plupload which can check file size, show progress bar, single dialog for multiple files, and supports things other than Flash if needed.
Is there any library/module available with which i can generate images from a swf file?
The problem i am trying to solve is: I want to create a pdf from a web page and i am having problems in doing that when the web page has swf (question in stackoverflow)
I am thinking if i am able to read a swf and write out an image, i will be able to solve the above the problem
Will appreciate your help, Thanks
In fact, that is quite a hard task. I've spent hours looking for a program that could fulfill such a task. However, I eventually only found one. It isn't open-source but would really help you I guess.
Flash Animation Source can output all frames of a SWF file. It uses a DirectShow filter to do so. Therefore, a Windows operating system is required should you not want to use WINE.
In short, you'll just need to install Flash Animation Source on your computer and then find a way to get DirectShow frames using your desired programming language. Everything else is actually quite easy. You tell Windows the directory and the name of your SWF file and it'll do the rest, thus delivering you with an image. And did you know DirectShow filters can deliver all frames of a video? Therefore, you can choose which one you'd like to have.
By the way, please don't try to find another way to get an image of your SWF file. Believe me, you won't find one. I have looked for an open-source program that fits my needs but all of them fail. You need to use the propriertary Adobe Flash player for your outputs. There is no other option as the open-source alternatives still need a lot of development to genuinely output the vector-based frame as it is.
I would like to extract a thumbnail from a RAW image file, like Canon's .CR2 or Nikon's .NEF. I've understood that this can somehow be done with ImageMagick, but haven't grasped if it's possible through the PHP wrapper.
Are there any good solutions? Preferably using the built in thumbnail for speed.
Yep, iMagick (the php version of ImageMagick) can handle these extensions: http://www.imagemagick.org/script/formats.php
Here's a great set of tuts that got me going with Imagick. The owner responded to a few of my questions quickly, and despite a bit of a language barrier was able to easily get me through my hurdles
As an aside, I've begun using Gallery to do image admin. No need to worry about thumbnailing, uploading, etc....it's all automatic. Then on the front end I can do jquery magic (getting photos via php query from the gallery database tables) to make it look really good.
Likely, if PHP's imagemagick libraries are to support this, they would be drawing from some functionality exposed through imagemagick's 'identify' command line tool (as the tool would be itself exposing functionality in the imagemagick libraries). Looking at the documentation for this tool, it doesn't look good. If you tried running identify -verbose, theoretically, the thumbnail information would appear in there somewhere, perhaps as an encoded value. Try it yourself: if it does, maybe you could possibly further extract the information returned from identify, either through the imagemagick functions in PHP (though I don't see any past the Exif libraries which only work on JPEG), or by scraping the return of a PHP system call to the identify tool.
Either way, doesn't look likely.
Benjamin Horn has submitted a complete example about reading the requested data and even saving it locally for later use.
Check this out:
https://benjaminhorn.io/code/extracting-thumbnails-from-camera-raw-files-cr2-and-nef-with-php/
I am interested in finding the most reliable method for uploading files in PHP. I need a progress bar with the upload.
I have tried SWFUpload but it randomly issues an I/O Error. Even if the same file is uploaded sometimes there is an error and sometimes there is not. I have configured all the necessary INI/Mysql/Apache directives to accept large file uploads.
So, I am looking for alternatives as a Flash based solution has not worked. Would Java be more reliable? I have also looked into PHP with APC.
I definitely cannot afford these random errors, so any help on reliable software / suggestions on how to minimize them would be appreciated.
Thank you.
There are other flash based solutions other than SWFupload. Have a look at uploadify.com
I haven't come around to try this myself yet but http://www.plupload.com/ might be what you're looking for on. But otherwise PHP + APC works good as well.
I am assuming 2 things here:
1) Some kind of client will be doing the file upload
2) You get some kind of say on what the client installs on their computer to help make this happen.
If this is the case, my first suggestion would be:
Give them FTP or SFTP client software to upload files. The php page you make can have a link to Filezilla, along with instructions on how to use it. ftp and sftp are THE protocols to use for transferring files. HTTP is just not designed(well) for it, nor are browsers.
Before anyone rips me a new one...I HAVE PERMISSION to hotlink images from an external site. It works all good, however I don't like that everytime i refresh the page it pulls the images again. My server is running PHP, is there a way to cache the images once, then display them via some local code. I'm really just looking for a way to speed up the page, and not waste anyones bandwidth. Thanks in advance.
I was looking for an answer to this myself and didn't find anything that fit my needs perfectly. TimThumb came close (you'll have to Google it; I'm a newbie and can thus only post one hyperlink), but it was a little overkill (it has all kinds of image manipulation stuff built-in) and couldn't handle some of the image types I was interested in using (specifically *.ico files). So I wrote my own quick-n-dirty PHP script that should handle any image type and is only concerned with caching the images alone and passing them through without any modifications.
I'm a bit concerned my script may have glaring security flaws or could be more efficient. Also, it's not very smart the way it caches. It never bothers to check later to see if the image has been updated, and it never bothers to clean up its own cache. If anyone has suggestions for improvements to my code, I'm open to feedback.
Here's the script: Warm linker - RefactorMyCode.com
You might consider using a proxying CDN like CoralCDN.