Images in Frame Folder out of focus

Viewed 794 times, With a total of 8 Posts
Wechseln zu: Navigation, Suche

Gets Around
Wiki Edit 19
Threads 8
Posts 56
After scanning a 50 foot roll of super 8 movie film, and processing through "generate Frames", an examination of individual frames shows that they are out of focus, all of them.
Scanning was done at 3200 resolution, 4:3. The scanner has a flat piece of glass with electrical tape masking a channel for the film, and the film is emulsion up, in contact with the scanner glass.
As a check, the same film was projected onto a ground glass plate and the images were very sharp.
Is it possible for the scanner to lose focus?
The scanner is an Epson v300, scanning 6 frames because of the narrow scanning light. I am using the professional settings, 3200 resolution, positive film, with none of the adjustment boxes checked
at the bottom of the main scanner window.

Wolfgang, I did find the renumbering software, which worked very well. I also found some NCH software for movie editing "videopad" but have not been able to proceed due to the focus issue described above.

would appreciate any comments you may have, or suggestions of how to resolve the focus issue.
Thanks,
Johnc

Gets Around
Wiki Edit 19
Threads 8
Posts 56
Wolfgang,
This is a sample of a frame which I refer to in my last post
SCA30002821.jpg

The image is a jpg, ‎(704 × 528 pixels, file size: 66 KB, MIME type: image/jpeg)
Is the image out of focus because it just 704x528. 66kb seems small
hope this helps.
Thanks,
johnc

Gets Around
Wiki Edit 990
Threads 10
Posts 73
Images out of focus
Hello John,

first a question: what do you mean by "has a flat piece of glass with electrical tape masking a channel for the film". Is that how you guide the film through the scanner. Can you probably provide an image of your film guide.

The optimal distance of the footage from the scanner glass is scanner hardware dependant, but it is normally not the surface of the scanner glass.

For my Epson V750 Pro the distance of the film from the scanner glass is about 2 mm above it.
And for the V750 it is also dependent on the resolution you use.
So the best I can recommend to you, is to test what the optimal distance for your scanner is.
There may also be manufacturing inaccuracies between scanners of the same typ. And even between the left and right side from the transparency unit. This becomes normally a problem with very wide TPU's. For a 2 inch wide TPU the differnce between left and right side normally is not a problem.

To place the footage directly on the scanner glass very likely will not give you the best images.
Try to lift the footage step by step - e. g. by putting some material between the film and the scanner glass. I found out the optimal distance by folding a piece of paper. Use 1, than 2 than 3 and so on layers of paper until you think you found the optimum.

Sometimes it is also a good idea to move the area in which you scan a strip a little bit up and down because the sensors travel on a guide inside the scanner and there may also be some manufacturing inaccuracies. And as we deal with very big enlargements even a tiny inaccuracy may be recognized in the final scanning result.

And for optimal scanning speed normally it is good practice to place the scanning area towards the point, the scanner sensor bar starts. That minimizes the time the sensor needs to go to the scanning area.

I hope, you will be successful in finding the optimal scanning parameters for your scanner.
You may have a look in the reommendations on how to craft a good film guide in the Wiki.

Regards
Wolfgang


Epson Perfection V750 Photo, Windows 7 (64 Bit) 16 GB. ScanController V0.7 mit Arduino Duemilanove, CineToVidPro 1.4

Gets Around
Wiki Edit 19
Threads 8
Posts 56
Wolfgang,
See the attached sketch of the guide I used
Guide.jpg
. It is similar to what is described in other posts, etc., however The film is sandwiched pretty close to the glass.
I understand your comments concerning optimum placement above the scanner glass. I ran a scan of 35mm kodachrome slide, and the result was very sharp compared to the film scan (against the glass).
The slide is encased in the cardboard frame that elevates the slide 1-2mm above the glass, so I think that I understand why the scans are not in focus. Some experimentation is warranted.
concerning speed, with placement of the guide as shown on the sketch, one full cycle, scan + transport time = 56 seconds. Needless to say any reduction in cycle time will help. one 50' film roll ran me 722 strips which takes too long.
Thanks for the help.
Johnc

Gets Around
Wiki Edit 990
Threads 10
Posts 73
Strips out of focus
Hello John,

I think it is definitely the problem, that your filmstrip is placed directly upon the scanner glass.
Try to lift it a little - as described in the last posting.

Probably use a cartoon or plastic strip at which you glue the guidance tape. By that you can test, what is the best distance from the glass for your scanner.
You may also try a 1.5 to 2 mm thick aluminum rail you can buy in a tinker store.

Regards
Wolfgang

Gets Around
Wiki Edit 990
Threads 10
Posts 73
Example for Film Guide lifting
Hello John,

you may try out this:

Film Guide.jpg
Edited On 13:35:55 PM - Fri, Nov 13th 2015 by Hannibalstgt

Gets Around
Wiki Edit 19
Threads 8
Posts 56
Yes, That worked. I am not sure of the exact dimension of the green spacer, but can see difference in the focus.
Now, on to making a movie!
Question: I want a 25 frame movie with intent of burning a dvd.
After completing the processing with cintovid, I have an MPEG file to convert to a movie.
Can I do Post processing at this stage, i.e. brightness/contrast; unsharp; color correction?
I have Videopad software from NCH to do the conversion. will this do the job?
Can I insert Lead_in pictures, transitions, etc at this point, or using Videopad?
Since my film movies are 50', I want to put more then one on a DVD, At what point can i link them together to make a longer DVD movie, at the mpeg stage, or after post processing with Videopad?
Thanks,
Johnc

Gets Around
Wiki Edit 990
Threads 10
Posts 73
Post Processing
Hello John,

as I can see from the NCH VideoPad homepage, VideoPad seems to be a pretty comprehensive Video Editor.

You may have recognized, that you can do initial video creation either with FFMPEG or with VirtualDub and AviSynth. (see Options menu in CineToVidPro).
With FFMPEG you can only generate movies which are extracted with 25 fps (that is with fill frames).

I recommend to extract the strips without fill frames and use 18 frames per second.
Then generate the Video with the generated AviSynth Script and VirtualDub.

In VirtualDub select in the Video Menu the Compression (XVid) and convert the speed to 25 fps.
Using the generated AviSynth Script has the advantage that you generate a stabilizend and (almost) cleaned video.
This file you can import to VideoPad. In VideoPad you can combine several roles to make a longer film.
With Videopad you than can do any post processing required - e.g. add a lead in and lead out, add a titel ,rearrange the scenes etc. There are plenty of possibilities to generate a professional video.

Regards Wolfgang
Edited On 13:44:52 PM - Sun, Nov 15th 2015 by Hannibalstgt

Gets Around
Wiki Edit 19
Threads 8
Posts 56
Wolfgang,
I did the scan tests yo recommended with .5,1 1.5 2mm spacers, but did not find the point of focus.
Examining the film with a very strong magnifier shows good detail on the film. The scanner will scan successfully a 35mm kodachrome slide, with good focus, so I fail to understand who it won't focus on the film.
Only one detail of the scan guide I am using causes some doubt, and that is that the thickness of the guide is 3/4" so the scan light in the lid is sitting 3/4" above the film, rather the very close. with the 35mm slide it is against the slide holder.
I am confused, and am doubting that the Epson v300 is up to the task.
Any comments or suggestions will be welcome.
Johnc


Forum >> Software >> CineToVId and ScanController



Who's here now Members 0 Guests 0 Bots/Crawler 0


AWC's: 2.5.12 MediaWiki - Stand Alone Forum Extension
Forum theme style by: AWC