| Re: Reading & Displaying Latex Rendered images [message #178567 is a reply to message #178565] |
Mon, 02 July 2012 13:35   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
Karma:
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Senior Member |
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On 7/2/2012 7:24 AM, Fastian wrote:
> On Monday, July 2, 2012 3:53:13 PM UTC+5, Jerry Stuckle wrote:
>> On 7/2/2012 2:42 AM, Fastian wrote:
>>> On Friday, June 29, 2012 6:20:45 PM UTC+5, Jerry Stuckle wrote:
>>>> On 6/29/2012 6:24 AM, Fastian wrote:
>>>> > I am developing an application for the university. One basic
>>>> > module/ section of this application is Data Entry. The data
>>>> > is entered using Latex (Latex is a type setting language
>>>> > and is not a WYSIWYG language). The tex software converts the
>>>> > latex code into the required image. For better understanding
>>>> > visit the following link:
>>>> > http://www.forkosh.com/mathtexpreview.html
>>>> >
>>>> > You can see that on entering Latex code, the desired output
>>>> > is obtained which is actually an image. This image is produced
>>>> > by the Tex software and is being fetched and displayed on this
>>>> > page. Another way to get that image is as follows:
>>>> > <img src="http://www.forkosh.com/mathtex.cgi?$c=a+b$" alt="" border=0 align=middle>
>>>> >
>>>> > My issue is that I want to get the image generated due to the
>>>> > rendering of the Latex code and then display it after re-sizing
>>>> > and then want store it in the MYSQL database.
>>>> >
>>>> > As I dont know the name of the image produced due to rendering
>>>> > that's why I can not pick the image with its name. Therefore I
>>>> > tried using function "file_get_contents". Though it returns
>>>> > some garbage values on echo but what next?
>>>> >
>>>> > I need to know that how can I proceed further or suggest some
>>>> > better way to deal with these issues especially while dealing
>>>> > with LateX rendering. Thanks!
>>>> >
>>>>
>>>> You don't show the code you're trying to use, so it's all a guess as to
>>>> what's wrong. There are many possibilities.
>>>>
>>>> If you're going to display an image, you need to send it as an image.
>>>> My guess is that you're displaying it as text.
>>>>
>>>> Web pages are sent with a content-type of text/html. But if the web
>>>> page contains an image, the browser makes a second request to the server
>>>> for the image. The image will be sent with a content-type of
>>>> image/jpeg, image/gif, etc. So the first thing you need to do is ensure
>>>> you are sending the correct header when displaying it (in this case it
>>>> should be image/gif) (obviously this needs to be done in a separate
>>>> script from the rest of the page and accessed with an <img= tag).
>>>>
>>>> So what you could do is in your test page, put something like:
>>>>
>>>> <img src="testimg.php" ....>
>>>>
>>>> Then in your testimg.php file, fetch the file with file_get_contents
>>>> then display it with the correct headers, i.e.
>>>>
>>>> header ('Content-type: image/gif');
>>>>
>>>> Of course, if this is the only thing on your test page (it's sending
>>>> NOTHING else), you can skip the <img= ...> tag and just send the correct
>>>> content-type at the start of your script.
>>>>
>>>> --
>>>> ==================
>>>> Remove the "x" from my email address
>>>> Jerry Stuckle
>>>> JDS Computer Training Corp.
>>>> jstucklex(at)attglobal(dot)net
>>>> ==================
>>>
>>> Pls have a look on the code:
>>> As you suggested my testing.php file code is as follows:
>>>
>>> <?
>>> $image = file_get_contents('users.gif');
>>>
>>> header('Content-Type: image/gif');
>>>
>>> //imagegif($image); // I also tried to display image with imagegif but it also didnt work.
>>>
>>> ?>
>>> The code of getimage.php file is as follows:
>>> <html>
>>> <img src="testing.php">
>>> </html>
>>>
>>> But the image is NOT displayed on the browser.Where I am wrong?
>>> Both php files and image (users.gif) is present in the same directory.
>>> I have also noticed that <img src= ""> do not work on the page where you have used header('Content-Type: image/gif'); ......... why?
>>>
>>
>> Where are you outputting the image? file_get_contents() does not output
>> anything.
>>
>> And no, <img src=..."> is an html command, and valid in pages with
>> content-type of text/html.
>>
>> I think your first problem is not understanding how html works. A
>> response has one content-type. A typical web page will have a
>> content-type of text/html, and will contain html code. <img src=...> is
>> an html command.
>>
>> Tags like <img src=...> (and many others) will cause an additional
>> request to be made to the server. If the content-type of the response
>> is image/gif, then the browser will only process it as an image. If it
>> is not a valid image, the browser will ignore it.
>>
>
> Ok. I got your point. But as it is the requirement of my project to store
> the complete question as an image in addition to storing latex text.
> Therefore I need to process the images (both question + options) and
> have to make them transform into a complete question.
> Therefore I thought that file_get_contents() may be helpful in this
> case as it then enable me to use imagecopy () and other functions.
> what you say?
>
Why would a customer care whether the question is stored as a single
image or separate entries? In over 40 years of programming I've never
had such a requirement in a project. I admit I've had some stupid
requirements in the past - but I've always been able to convince the
customer why it should not be done that way. All part of being a
successful consultant.
I would go back to the customer and explaining why it is a bad idea and
convince the customer to change the requirement.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================
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