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 Saving to jpeg issue		  New Topic  Reply to Topic
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cpstevenc

USA
116 Posts
Posted - Jul 27 2011 :  13:35:48  Show Profile  Reply
Using ImageEn 3.1.2

I have a problem where i read in an image, scale it, and export it out.

Code is like below...

Image := tImageEn.create(nil);
image.IO.LoadFromFile(fn);
w:=image.Bitmap.Width;
if (w>800) then image.proc.Resample(800,-1,rfnearest);
Image.io.Params.JPEG_Quality:=75;
image.IO.SaveToFileJpeg(outputFN);


Sometimes the output file "works" as in other apps can view it, but imageEN can not. ImageEN wont error out loading it, but it wont show anything either. And sometimes it just makes 0 byte files when saving.

fab

1310 Posts
Posted - Jul 27 2011 :  13:57:07  Show Profile  Reply
I cannot replicate this problem.
Please could you provide more details (i.e. an input image that produces this problem or a full project which replicate it)?
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cpstevenc

USA
116 Posts
Posted - Aug 22 2011 :  13:05:55  Show Profile  Reply
Sent
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fab

1310 Posts
Posted - Aug 22 2011 :  13:22:02  Show Profile  Reply
The file you have sent me is a PNG with ".jpg" extension. This can happen if you execute, for example:

Image.IO.SaveToFilePNG('1234.jpg'); // <- wrong extension!!

If you then reload the image using:

Image.IO.LoadFromFile('1234.jpg');

....it, of course, fails.

In fact you could load it using:

Image.IO.LoadFromFileAuto('1234.jpg');

...or open it with an hex editor to see the header (it is actually a PNG not a Jpeg).

Please check the code that actually generated the jpeg.
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cpstevenc

USA
116 Posts
Posted - Aug 22 2011 :  15:10:04  Show Profile  Reply
Thanks so much! I found others with same thing.. JPG extension.. and GIF header..

Ended up being i was saving images to JPGs... but those were the scaled down versions. The "original" image was getting copied over to a new location and renamed.. and the extension was jpg.

Located and fixed it on my side.. thanks!

< i feel so dumb >
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