Color JPG image saved by imwrite() incompatible with Web Browser.
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Hello There,
I am trying to read a file from the server and display on the webpage using JSP. The file is created using imwrite(). I have tried .jpg and .png. I have tried grayscale (8-bit depth) and color (24-bit depth). I have tried on Internet Explorer and Google Chrome. Nothing works and the image is not displayed. I have no problems displaying images downloaded from the internet.
I presume there is something in the file format that is causing all this problem. If required, I could email two .jpg file, one that works fine and the other that does not.
The MATLAB code used to create this image is:
imwrite(g,'../image/image.jpg');
Please help.
Thanks and Regards.
JSP code below:
<!DOCTYPE html>
<%@ page import="java.util.*" %>
<%@ page import="java.util.Calendar" %>
<%@ page import="java.io.File" %>
<%@ page import="java.io.*" %>
<%@ page language="java" import="java.util.*"%>
<head>
<script language="JavaScript">
var refreshImageFlag;
function refreshFlagEnable(){
refreshImageFlag = true;
}
function refreshFlagDisable(){
refreshImageFlag = false;
}
function refreshIt() {
if (!document.images) return;
if(refreshImageFlag == true){
tmp = new Date();
document.images['myCam'].src = "C:\\WebDev\\uploads\\image\\image.jpg" + "?" + tmp.getTime();
}
}
</script>
</head>
<BODY onLoad="setInterval('refreshIt()',1000);">
<<C---WebDev--uploads--image--image.jpg>>
<FORM NAME="form1" METHOD="POST">
<input type="button" value="StartRefresh" onclick="refreshFlagEnable();"/>
<input type="button" value="StopRefresh" onclick="refreshFlagDisable();"/>
</FORM>
<<C---WebDev--uploads--image--image.jpg>>
</BODY>
Answers (2)
Walter Roberson
on 21 Oct 2011
img src="file:///C:\WebDev\uploads\image\image.jpg"
9 Comments
Protik Maitra
on 24 Oct 2011
Walter Roberson
on 24 Oct 2011
What happens if you read a jpg file using imread() and then write it out (with a different name) using imwrite() ? Compare imageinfo() of the two [if you have the Image Processing Toolbox]
Protik Maitra
on 24 Oct 2011
Moved: Rena Berman
on 28 Dec 2023
Protik Maitra
on 24 Oct 2011
Protik Maitra
on 24 Oct 2011
Moved: Rena Berman
on 28 Dec 2023
Protik Maitra
on 24 Oct 2011
Walter Roberson
on 24 Oct 2011
Moved: Rena Berman
on 28 Dec 2023
The characteristics _look_ okay.
I suggest trying doing the imwrite() with the JPEG-specific parameter 'Quality', 100
I also suggest trying imwrite with 'mode', 'lossless'
I cannot think of any reason that the images might be incompatible, but we might at least be able to figure out the file size difference.
Also there is a routine imfinfo() which should tell you details such as the EXIF tags.
Protik Maitra
on 26 Oct 2011
Moved: Rena Berman
on 28 Dec 2023
Protik Maitra
on 26 Oct 2011
Moved: Rena Berman
on 28 Dec 2023
Richard Zapor
on 20 Dec 2011
0 votes
The array may be lacking the full data structure. The site http://radio.feld.cvut.cz/matlab/techdoc/printing/export21.html gives a method for establishing the structure and then using imwrite to produce a valid jpg.
figure;imagesc(data) I = getframe(gcf); imwrite(I.cdata, 'myplot.jpg', 'Quality', 50);
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on 21 Oct 2011
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