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export image jpg problems


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Sometimes (usually 10 minutes before a print deadline) an "export image file-jpg" will result in an image that looks like the horizontal hold on a TV screen has failed. I'm exporting an image 2400 wide at 300dpi.

Anyone else experienced this?

Using VW9.5.1 with 128M RAM, under Mac OS8.6

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QuickTime takes over for this function. There are some limitations of this function as far as memory goes. The large the bit size, the more pixels that are specified, the larger the file goes and sometimes QuickTime just can't handle it. Sometimes it results in an error or it will conk out and give you an image that looks like bad reception on an old tv. One trick of the trade is to put a perspective window around the part of the drawing you want to include in the export. This will give the application and QuickTime a out of bounds limit and will not write the extra, unnecessary information.

You can also change the compression options for the JPG by clicking on the compression button. If the drawing is all in black and white, you should select the black and white option. If you just have a few of the basic colors, select color. You can try changing the slider around to see if you can get an acceptable export with lowering the slider as far as quality. Sometimes you can get the same quality image by changing the slider to low rather than medium where it's the default.

[ 06-18-2002: Message edited by: Katie ]

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Is there any difference in how VW hands off this export duty, between OS9 and OSX? I tried a 3000x2400 image from VW951 under X.1.4, with 512 of physical RAM, with the same results as under OS9. Do you know if Not-so-quicktime will continue to impose upon us these stupid limitations due to the code's inadequacies? Why do editor apps such as Photochop not have the same difficulty?

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Just to revise Katie's statement a little...

The horizontal sync issue with jpeg exports is actually a bug in QuickTime's jpeg compression system when dealing with large images. Apple is aware of it and it will eventually be fixed.

If it is not fixed in the upcoming final release of QuickTime 6, I am told that there is a code change we can make on our end, but it will slow down the export procedure. Either way it should be fixed in time for the next big release.

In the meantime, export as a PNG file and use a graphics program to convert to a JPEG.

T.S,VectorWorks uses the same code for OS X and OS 9 in this regard. Since QuickTime also shares a common code base between platforms, I would expect you will get this on all 3 platforms. OS 9, OS X and Windows.

Remember, the image export options are not designed for high end press graphic output. They were designed to work with screen resolution graphics. If you need high resolution output, you should be getting it out of the printing system.

Photoshop and other graphic editing programs implement their own schema to handle various file formats. Sure VectorWorks theoretically could have more robust image import/export functionality, but 99% of our user base would never use them to that extent. Is that worth increasing development costs which then would result in VectorWorks costing the end user more?

You have to draw the line somewhere.

Matthew GiampapaNNA Technical Support

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