Digital Workshop

Hi,

This is one of the greatest features of Opus 05, but I do have one quick question/wish.

An option to enable this by default on all images in the Opus options.

The second is for opening publications from Opus 04 so that with a single click all images will have Bilinear Re-sampling enabled as default.

This would save me a hack of a lot of time.


Joe

Tools -> Options -> Defaults page -> Bilinear Resample

DW you have all the answers. That's great will save me a lot of time.

Thanks a bunch,

Joe

Duncan --

Could you please tell us what "bilinear resampling" is, and what using it does? What are the advantages/disadvantages. If there are only advantages, then why isn't it the normal default? Is it for video or audio?

Bilinear resampling is a method of resizing images in a high quality manner. The normal resize just drops unwanted pixels; bilinear resampling averages the missing information.

For example, if you had a 300 pixel square image sized to 100 pixels, the normal resize would simply take every third pixel; which can result in "jaggies" (steps in smooth lines).

Bilinear resampling looks at the pixels that will be thrown away and computes a new pixel based on the averages. This produces a much higher quality image, but is obviously slower because there is a lot more maths for every single pixel.

The advantages of resampling are immediately obvious if you resize a line art image or one with high density detail.

It is not turned on by default as it is noticeably slower than a simple pixel size and always will be - there is simply a lot more calculation to be done.

Bilinear resize is only applied to images - it has nothing to do with audio and is too slow for video (most video cards these days perform a hardware assisted resample anyway).

hello,

i've attached an example comparing an image in opus. the left image has not got bilinear resampling enabled. the image on the right does. notice how much better the image on the right looks.

also have a look at:
http://www.imgfsr.com/ifsr_resamp.html
notice the edge of the coins and how bilinear resampling smooths the edges?


i find this feature especially useful for publications which can be resized, Chapter Properties > General > Resizing. the output is always crystal clear.

is there any plans to support Bicubic Resampling duncan? i always ask for more!

regards,

luke

sorry about the large image, but it's the best way to show the difference.


Comment added by Duncan: I have replaced the image with a revised version that does not break the page formatting quite so badly.

Not really - it's even slower for a minimal improvement in quality.

Luke --

Thanks for the picture samples. A picture IS worth ten thousand words.

Duncan --

Is the bilinear resampling done only one time when you Publish or every time you view your final Pub? There would be no bilnear resampling done if you are using the original image size, right?

If bilinear resampling is performed everytime someone views your Publication, then the viewing computer would be doing the calculations, so Pages/Objects might take longer to appear, right? Very interesting to learn about this. TIA