Thank you Carl312, I have just tested Irfanview on your recommendation. I have done a few test shots and everything still lines up in PD9 so the size advice is sound. The preserve aspect ratio is the important factor.
BUT, trying to preserve the Alpha channel, I have suddenly got ghost actors. They are semi transparent. If I turn the alpha channel options off I get a black background. Have I done something wrong? I have tried different settings.
I have selected PNG Compression level 6(Default),selected 'Save transparent color', 'Save transparency as Alpha channel'.
I then select advanced options and resize to 1920x1200 preserving the aspect ratio.
As I say, I end up with a ghost actor with Save Transparent color, or a black background with it off.
Frustrated as I clearly do not understand what I have done wrong, and muttering to myself under my breath at how stupid I must be, and this whole computer thing is just a conspiracy to overthrow the civalised world, I look further afield and have now tried a plethora of different programs, but none have been able to do what I require.....until.... (suitable pause)
I came across 'AnyPIC Image resizer pro' which is a lot happier. I have been able to get an image with the required alpha channel that is transparent and a subject that is not transparent, with a good quality that has not become pixelated, or with jagged edges. Yes it does cost $19.90, but it works and it works well. It's quick. For something that costs less than a paperback novel! I will happily pay the money as it is the final part of the solution just to get rid of the watermarks the test version makes.
I have whistled through all the PNG's in all the different folders with 'AnyPIC Image resizer pro' and reloaded my failing project back into PowerDirector. I have now rendered the final MOV of the scene that was crashing PD9 before and .... Yah, happiness and light, it works, I am so chuffed, you have no idea. All those sleepless nights have been finally paid dividends, oh joy, oh bliss...etc etc. This 'AnyPIC Image resizer Pro' is going to take pride of place in the production pipeline for each scene now that will be offered up to PowerDirector. It is way more friendly than Photoshop Elements in that, Photoshop Elements batch process did not give a useable alpha channel either. Shame on them, they are supposed to be the professionals, how can they miss such an important option out. (Maybe because I am using an old version, V2)
You can say it is me. It's my fault. I don't know how to use the program etc. Yes you are probably right, but that is what drew me to PowerDirector 9, I like software that doesn't take a year to learn how to use it. It's intuitive, and makes everything so much more pleasant. I am sure I am not alone in this sentiment.
Thanks to you all for your help getting me to this point. Hey, I don't need to rush out to buy that expensive new computer either 'Dafydd Bevan - SoftDeko'. I know i will have to eventually, but maybe not until PowerDirector 10 or 11, or ....
Nina, this whole resolution, image size, file size stuff, works best with a glass of red wine, I am sure you will agree. Makes it much less stressful. The great thing is you don't need to read a thesis on PNG's to make things work, you just have to know who to ask to get to the right solution, or be pointed in the correct direction. :
Thanks again everyone. A load has been lifted from my shoulders. I really did not relish the prospect of repositioning some 200 frames again and redo all the chroma key work, and resizing and synchronising of sound effects etc.
By reducing the image by 50%, I am getting a 72dpi PNG with alpha channel weighing in at 594Kb @ 2136x1424 from a 1.85Mb 4272x2848 image in about 2 seconds. That has got to lighten the load on PowerDirector now. Checking the resulting image in photoshop, the deterioration in quality is not worth getting upset about.
Now I just need to put all the rendered HD AVI scenes together and check what new problems I have caused myself. But that is a problem for another time and another thread.
I have read lots of advise going into this project telling me to story board the movie, think your scenes & shots through, think about lighting, camera angles, optimum fps, how to accomplish the special effects in postproduction etc. But no one has ever offered the advice that you should consider the dpi, or image size that you are shooting in or the consequence of going too big. You want good results, so you automatically think that big is best.
So it has now been proved that 'Less is more'. I always used to scoff at that saying, it certainly does not apply at MacDonalds. Now I know what it means.
If anyone can help, I'm still struggling with the meaning of 'Pink is the new Blue', I guess that must be something to do with Chromakeying.
Thanks again to you all.
(Skips off happily into the sunset. Fade to black. Roll credits.)
Dragging PowerDirector 9 along with a 32-bit Win XP PC Dual Core 2.22Ghz with 3.5 Gig Ram, NVIDIA GeForce GT430, but still Comfortable and pleased with it.