| Re: Reading & Displaying Latex Rendered images [message #178569 is a reply to message #178567] |
Mon, 02 July 2012 13:41   |
Jerry Stuckle
Messages: 2598
Registered: September 2010
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Senior Member |
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On 7/2/2012 9:35 AM, Jerry Stuckle wrote:
> 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.
>
To clarify: by stupid requirement I mean having to put the question and
all the answers together into one image.
--
==================
Remove the "x" from my email address
Jerry Stuckle
JDS Computer Training Corp.
jstucklex(at)attglobal(dot)net
==================
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