I believe it&#39;s because the JPEG you&#39;re working with is a progressive JPEG, which has a different mime-type.

IE can upload all .jpeg files as its hack MIME type &#39;image/pjpeg&#39; regardless of whether or not they&#39;re actually progressive.

Don&#39;t rely on the MIME type supplied in a file upload, there is every chance it could be wrong for a variety of reasons including this one.


Because Microsoft likes to violate standards. There&#39;s no such MIME type as image/pjpeg.  See for yourself:
http://www.iana.org/assignments/media-types/media-types.xhtml#image

The correct MIME type for JPEG is image/jpeg, progressive or not.

There is same problem with png:

IE7: image/x-png
Normal browsers: image/png

;)

Is it possible to prevent stack allocation of an object and only allow it to be instiated with &#39;new&#39; on the heap?

Is it possible to prevent stack allocation of an object and only allow it to be instantiated with &#39;new&#39;?

What is the best way to resolve a conflict when doing a `git svn rebase`, and the git branch you are on becomes &quot;(no-branch)&quot;?


How to resolve a conflict with git-svn?

When uploading a file (jpeg) via a form in IE7 I am seeing a mime-type of &quot;image/pjpeg&quot; instead of &quot;image/jpeg&quot; (as I see in Firefox or similar).  It&#39;s easy enough to work around this problem, but I&#39;m just wondering why IE7 is behaving differently in this case?

Why does IE7 specify a mime-type of image/pjpeg rather than just image/jpeg?

<p>When uploading a file (jpeg) via a form in IE7 I am seeing a mime-type of "image/pjpeg" instead of "image/jpeg" (as I see in Firefox or similar).  It's easy enough to work around this problem, but I'm just wondering why IE7 is behaving differently in this case?</p>


I need to debug JavaScript in Internet Explorer 7.

Unfortunately, its default debugger doesn&#39;t provide me with much information. It tells me the page that the error showed up on (not the specific script) and gives me a line number.  I don&#39;t know if that is related to my problem.

It&#39;d be nice if it could narrow down the error to a line number on a specific script (like Firebug can).

Is there an addon to debug JavaScript in IE7 like Firebug does in Firefox?

Thank you!

### See also:
[Does IE7 have a “developer mode” or plugin like Firefox/Chrome/Safari?][1]


  [1]: https://stackoverflow.com/questions/56615/does-ie7-have-a-developer-mode-or-plugin-like-firefoxchromesafari

Debugging JavaScript in IE7

I&#39;m trying to &quot;force&quot; Safari or IE7 to open a new page _using a new tab_.

Programmatically I mean something like:

    window.open(&#39;page.html&#39;,&#39;newtaborsomething&#39;);

Programmatically open new pages on Tabs

Like everyone else, I need to test my code on Internet Explorer 6 and Internet Explorer 7. Now Internet Explorer 8 has some great tools for developer, which I&#39;d like to use. I&#39;d also like to start testing my code with Internet Explorer 8, as it will soon be released.

The question is: how to run Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8 on the same machine. So far with Internet Explorer 6 and Internet Explorer 7 I&#39;ve been using [Multiple IE][1]. But people have reported (see comments on the page linked in the previous sentence) issue with Internet Explorer 6 after installing Internet Explorer 8. Those errors are related to focus in form fields. Running Internet Explorer 7 wouldn&#39;t matter so much as Internet Explorer 8 can use the Internet Explorer 7 rendering engine, but we still need Internet Explorer 6.

How to run Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8 on the same machine?

  [1]: http://tredosoft.com/Multiple_IE?page=6


Running Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8 on the same machine

Is there a way to force IE8 into IE7 compatibility mode using .NET or Javascript?

Force IE8 Into IE7 Compatiblity Mode

&gt; **Possible Duplicate:**  
&gt; [Running Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8 on the same machine](https://stackoverflow.com/questions/574463/running-internet-explorer-6-internet-explorer-7-and-internet-explorer-8-on-the)  

&lt;!-- End of automatically inserted text --&gt;

I need recommendations on a good Internet Explorer standalone for Internet Explorer 6, Internet Explorer 7 and Internet Explorer 8.

I tried using [Tredosoft&#39;s Internet Explorer 7 standalone][1] and MultiIE for Internet Explorer 6, but select elements were being blocked as pop-ups, even when the pop-up blocker was turned off, in all Internet Explorer browsers (6,7,8).

I also tried the Internet Explorer Collection from Edskes, but Internet Explorer 6 and Internet Explorer 7 refuse to let me type in a text box.

If someone can provide me with either a solution or an alternative that&#39;d be brilliant.

Also, I&#39;m using [VMware Fusion][2] to run Windows XP on my Mac.

  [1]: http://tredosoft.com/IE7_standalone
  [2]: http://en.wikipedia.org/wiki/VMware_Fusion


Need a good Internet Explorer 6, 7, 8 standalone

I have a form that excepts a file upload in ASP.NET. I need to increase the max upload size to above the 4 MB default.

I have found in certain places referencing the below code at [msdn][1]. 

    [ConfigurationPropertyAttribute(&quot;maxRequestLength&quot;, DefaultValue = )]

None of the references actually describe how to use it, and I have tried several things with no success. I only want to modify this attribute for certain pages that are asking for file upload.

Is this the correct route to take? And how do I use this?


  [1]: http://msdn.microsoft.com/en-us/library/system.web.configuration.httpruntimesection.maxrequestlength.aspx

How to increase the max upload file size in ASP.NET?

Is there a `HTMLHelper` for file upload? Specifically, I am looking for a replace of

    &lt;input type=&quot;file&quot;/&gt;

using ASP.NET MVC HTMLHelper. 

Or, If I use 

    using (Html.BeginForm()) 

What is the HTML control for the file upload? 

Html helper for &lt;input type=&quot;file&quot; /&gt;

How can I get an ASP.net web form (v3.5) to post a file using a plain old `&lt;input type=&quot;file&quot; /&gt;`?

I am not interested in using the ASP.net FileUpload server control.

Uploading Files in ASP.net without using the FileUpload server control

I would like to have jQuery limit a file upload field to only jpg/jpeg, png, and gif. I am doing backend checking with `PHP` already. I am running my submit button through a `JavaScript` function already so I really just need to know how to check for the file types before submit or alert.

How to have jQuery restrict file types on upload?

I want to reset a file upload field when the user selects another option.

Is this possible via JavaScript? I&#39;m suspecting that the file upload element is treated differently because it interacts with the user&#39;s file system, and maybe it&#39;s immutable.

Basically, what I want is something like (pseudo-code):

    // Choose selecting existing file
    $(&#39;#select-file&#39;).bind(&#39;focus&#39;, function() {
      // Clear any files currently selected in #upload-file
      $(&#39;#upload-file&#39;).val(&#39;&#39;); 
    }) ;

    // Choose uploading new one - this works ok
    $(&#39;#upload-file&#39;).bind(&#39;focus&#39;, function() {
      // Clear any files currently selected in #select-file
      $(&#39;#select-file&#39;).val(&#39;&#39;); 
    }) ;

NB: **This question and its answers span the period from 2009 to today.** Browsers and approaches have changed in that time, please select your solutions with this in mind :)

Clearing an HTML file upload field via JavaScript

I&#39;m attempting to use Python to convert a multi-page PDF into a series of JPEGs. I can split the PDF up into individual pages easily enough with available tools, but I haven&#39;t been able to find anything that can covert PDFs to images.

PIL does not work, as it can&#39;t read PDFs. The two options I&#39;ve found are using either GhostScript or ImageMagick through the shell. This is not a viable option for me, since this program needs to be cross-platform, and I can&#39;t be sure either of those programs will be available on the machines it will be installed and used on.

Are there any Python libraries out there that can do this?

Converting a PDF to a series of images with Python

Do you know of any tools (preferrably command-line) to automatically and losslessly optimize JPEGs that I could integrate into our build environment? For PNGs I&#39;m currently using [PNGOUT][1], and it generally saves around 40% bandwidth/image size.

At the very least, I would like a tool that can strip metadata from the JPGs - I noticed a strange case where I tried to make thumbnail from a photograph, and couldn&#39;t get it smaller than 34 kB. After investigating more, I found that the EXIF data was still part of the image, and the thumbnail was 3 kB after removing the metadata.

And beyond that - is it possible to further optimize JPGs losslessly? The PNG optimizer tries different compression strategies, random initialization of the Huffmann encoding etc. 

I am aware that most savings come from the JPEG quality parameter, and that it&#39;s a rather subjective measure. I&#39;m only looking for a tool that can be run as a build step and that losslessly squeezes a few bytes from the images.

  [1]: http://www.advsys.net/ken/util/pngout.htm

Tools for JPEG optimization?

I have a bunch of high quality PNG files.  I want to use PHP to convert them to JPG because of it&#39;s smaller file sizes while maintaining quality.  I want to display the JPG files on the web.

Does PHP have functions/libraries to do this?    Is the quality/compression any good?

Use PHP to convert PNG to JPG with compression?

I&#39;ve been a web developer for quite some time, and I am used to transforming all my designs into the png file format in order to build my webpages. Despite the fact that png, contrary to jpg, allows transparency in the images, is it a better solution? 

The question regards page loading time and best webdesign practices, as well as file size versus quality of the images.

What do you think is the best solution to use?

webdesign - jpg or png, which one is the best for web

This is really a two part question, since I don&#39;t fully understand how these things work just yet:

My situation: I&#39;m writing a web app which lets the user upload an image. My app then resizes to something displayable (eg: 640x480-ish) and saves the file for use later.

My questions:

1. Given an arbitrary JPEG file, is it possible to tell what the quality level is, so that I can use that same quality when saving the resized image?
2. Does this even matter?? Should I be saving all the images at a decent level (eg: 75-80), regardless of the original quality?

I&#39;m not so sure about this because, as I figure it: (let&#39;s take an extreme example), if someone had a 5 megapixel image saved at quality 0, it would be blocky as anything. Reducing the image size to 640x480, the blockiness would be smoothed out and &lt;strike&gt;barely&lt;/strike&gt; less noticeable... until I saved it with quality 0 again...

On the other end of the spectrum, if there was an image which was 800x600 with q=0, resizing to 640x480 isn&#39;t going to change the fact that it looks like utter crap, so saving with q=80 would be redundant.

Am I even close?

*I&#39;m using GD2 library on PHP if that is of any use*

Content Type	Original Author	Original Content on Stackoverflow
Question	John Montgomery	View Question on Stackoverflow
Solution 1 - Internet Explorer-7	Pseudo Masochist	View Answer on Stackoverflow
Solution 2 - Internet Explorer-7	bobince	View Answer on Stackoverflow
Solution 3 - Internet Explorer-7	Stewart	View Answer on Stackoverflow
Solution 4 - Internet Explorer-7	h-tech	View Answer on Stackoverflow

Why does IE7 specify a mime-type of image/pjpeg rather than just image/jpeg?

Internet Explorer-7 Problem Overview

Internet Explorer-7 Solutions

Solution 1 - Internet Explorer-7

Solution 2 - Internet Explorer-7

Solution 3 - Internet Explorer-7

Solution 4 - Internet Explorer-7

How to resolve a conflict with git-svn?

Is it possible to prevent stack allocation of an object and only allow it to be instantiated with 'new'?

Attributions