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PObitmap save jpeg failled but png is ok because of the comments property
 

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  1. PObitmap save jpeg failled but png is ok because of the comments property
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    <p><strong>Question Description:</strong></p> <p>when I save the bitmap to a JPEG file with JPEG format mode, a Gdi exception was thrown. But when i save it with a PNG format mode, it can be saved successfully.</p> <p><strong>Quick Recreate:</strong></p> <ol> <li><p>Please save the images to .jpg file from the broswer. click here: <a href="http://www.screencast.com/t/JlMn7SRr" rel="nofollow noreferrer">IncorrectImage</a>, <a href="http://www.screencast.com/t/TVJvAQCp" rel="nofollow noreferrer">CorrectImage</a>.(actually, in our application, we request the image on the fly and then save the image to JPEG.)</p></li> <li><p>using the below code to see the exception:</p> <p><code>string newFile = @"D:\Temp\newImage.jpg"; var newBitmap = Image.FromFile(@"D:\Temp\IncorrectImage.jpg"); newBitmap.Save(newFile,System.Drawing.Imaging.ImageFormat.Jpeg);</code></p></li> </ol> <p><strong>What i found:</strong></p> <p>after a deep investigation, i found out the root of the issue is from <strong>the Comments property</strong> of the orginal image. when i delete the the property value, the error disappears. Besides, after i just copy the value of the comments value of the image to notepad and then paste back, the image can be saved into a new image with the upper code and the size of the image even is larger! <img src="https://i.stack.imgur.com/dzBd5.png" alt="enter image description here"></p> <p>So, i guess the comments property might includes some sensitive or incorrect charector when saving to a jpeg file. Would guys can give our some insights on those comments? </p> <p>thanks in advanced.</p> <p><strong>More try:</strong></p> <p>I try the below code:</p> <pre><code> //foreach (var item in newBitmap.PropertyItems) //{ // if (item.Id == 37510) // { // item.Value = null; // item.Len = 0; // } //} newBitmap.RemovePropertyItem(37510); newBitmap.Save(newFile, System.Drawing.Imaging.ImageFormat.Jpeg); </code></pre> <p>if I remove the property item, then the newimage can be saved successfully. However, if I just set its value null like the comment out codes, the exception is still thrown.</p> <p><strong>Please help me:</strong></p> <ol> <li>Why the image size is larger(orginal size is 48k, after cut and paste back it's about 78k) when I just clear the comments and then paste the same value back. Is it possible a bug?</li> <li>Why the image can be saved successfully after I clear the comments and then paste the same value back? is it the Clipboard filter some invalid charactors?</li> <li>Why the image still cann't be saved even I have set the comments property value is null? but if I remove the property, it can work, like the before i try?</li> </ol> <p>Hope you can help me find out the root of the issue. </p>
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      1. PObitmap save jpeg failled but png is ok because of the comments property
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      1. PObitmap save jpeg failled but png is ok because of the comments property
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    1. This table or related slice is empty.
 

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