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jpeg converted quality

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jpeg converted quality

Postby curt y » Tue Mar 22, 2011 10:17 pm

The jpeg pictues of charts I have as a slide show have lost a lot of quality. The chart picture opened in Photoshop shows an image size of 2550 x 3300 pixels and is very sharp.

When viewed on the DVD disk it is very fuzzy.

Is this normal, or do I need to do something different?
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Re: jpeg converted quality

Postby Steve Grisetti » Wed Mar 23, 2011 7:11 am

Your DVD is video resolution. Video resolution is is 720x480 anamorphic pixels -- the equivalent of 640x480 pixels.

Doesn't matter how large the photo or graphic you load into it, you still get only a 640x480 image.

Is this what you're seeing? How and where are you judging the picture quality?
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Re: jpeg converted quality

Postby curt y » Wed Mar 23, 2011 10:47 am

I looked at it visually in PS. Here is a screen shot of a small piece of the DVD superimposed on the jpeg shot.

Is there anything I can do to increase resolution so the info can be read?

By the way is there a max image size that can be uploaded. A 500k shot just gives me a white screen.
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Re: jpeg converted quality

Postby Steve Grisetti » Wed Mar 23, 2011 10:59 am

Don't judge the quality by what you see as a preview in DVD Architect, Curt. It's not been rendered yet.

If you resize your original graphic to 640x480 pixels, the output will look virtually identical to it.
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Re: jpeg converted quality

Postby curt y » Wed Mar 23, 2011 11:21 am

The fuzzy one is the screen shot of the DVD. One does loose a little on the screen shot, but is is close.

Any way to increase resolution, as it is really unreadable like this.
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Re: jpeg converted quality

Postby Steve Grisetti » Wed Mar 23, 2011 11:28 am

Nope.

As I said, you get 640x480.

If that's the resolution of your original graphic, the output should look almost the same.
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Re: jpeg converted quality

Postby Bob » Wed Mar 23, 2011 12:05 pm

The chart picture opened in Photoshop shows an image size of 2550 x 3300 pixels and is very sharp.


That's a huge size compared to a video frame. When you resize it to standard video frame size, you won't have anywhere near that resolution and it will be fuzzier. You'll get the best results if you resize it in Photoshop without flattening the image first (you want the text layers to remain as text layers and not be rasterized) and then save it. If you save the file as a jpg at 2550x3300 and then scale it in premiere, the text will have been rasterized before scaling and it will look a mess. Don't expect miracles. If it doesn't look good in Photoshop at 640x480, it won't look good in premiere either.
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Re: jpeg converted quality

Postby curt y » Wed Mar 23, 2011 12:08 pm

Here is an original of 623 x 479 pixels and a screen shot of the DVD. Don't know how much I loose in the screen shot (ms snap it).

One can see a significant change in quality. Is this just normal conversion problems?
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Re: jpeg converted quality

Postby Bob » Wed Mar 23, 2011 12:19 pm

You need to see how it looks on an actual TV. Your computer monitor is much higher resolution and if you display full screen it will look much worse than what it will look like on a TV. If you audience is going to be using a TV to view this, proof it on a TV. If they are only going to be viewing on a computer, perhaps you should rethink the DVD idea and just go with higher resolution wmv or mov files for viewing on a computer.
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