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Re: why does the output jpeg look not as good as shown on screen? [message #49772 is a reply to message #49771]

Mon, 14 August 2006 16:09

Benjamin Hornberger is currently offline

Benjamin Hornberger
Messages: 258
Registered: March 2004

Senior Member

ltsmktip21@gmail.com wrote:
> Using the following commands:
>
> tvimage,imageout,position=[0,0,1,1]
> a=tvrd(true=3)
> write_jpeg,'out.jpg',a,true=3
>
> when I use kuickshow to display the image, the saved image is not as
> clear as it is shown in the IDL plot winodw, it is kind of blurring and
> dimmer. Can one make a jpeg file which is identical to the one shown in
> the IDL plot window?
>

I guess what you see is artifacts of the JPEG compression, which is a
lossy compression. These artifacts increase with the compression level
and are generally more pronounced for things like line plots, drawings,
large areas of constant color etc. as opposed to photographs.

You can try to increase the quality level of the JPEG (QUALITY keyword
to WRITE_JPEG), but if your image is more like a drawing than a
photograph, you might be better off using a different graphics format
like PNG (which uses lossless compression).

Benjamin

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[Message index]

		Re: why does the output jpeg look not as good as shown on screen? By: Maarten[1] on Mon, 14 August 2006 23:59
		Re: why does the output jpeg look not as good as shown on screen? By: David Fanning on Mon, 14 August 2006 16:12
		Re: why does the output jpeg look not as good as shown on screen? By: Benjamin Hornberger on Mon, 14 August 2006 16:09

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