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Negative

Aug 2, 2012, 17:52
Post: #1
Negative
I've been toying around with an idea to use a strip of 35mm negative film, that I dug out of an old shoe box, and inserting new images into the frames. The new images will hopefully have the look of a negative. Now the problem is I have no idea how to convert a jpeg into a negative or if it is even possible so I would be grateful for any help with this project.
Just in case of confusion I don' intend to stick the negatives to the strip of film but to do it all with Gimp. As to why I'm doing this...well, experimentation is the mother of invention as someone once said, or if they didn't then they should have, and I just want to see what this basic idea leads to.

In a totally unrelated topic I was wondering if it is best to set one of the AF points on a Canon, the centre one say, and use that for autofocus. I ask because I dipped a toe into the shutterstock waters and was told that the couple of pictures I posted where out of focus, not terribly so but enough so that they would be rejected.
There were some other problems with the pics, the main one being they lacked commercial value. So much to learn.

Cheers.

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Aug 2, 2012, 19:45
Post: #2
RE: Negative
- for B&W, color/invert. Or use the precise curve (inverted Gamma) the shape of the curve being specific to film brands (as well as the RGB to B&W response)
- for color use color/invert and add a bit of orange
- there a scripts to emulates the holes and markings.

When using multiple focus points you don't control which one is used (normally, the one with the closest focus). This is OK to shoot birds in flight but on the whole using only the center collimator will let you choose which part is in focus (usually, the eyes when shooting people or animals). And if you mount a lens with an aperture of 2.8 or above, the center "wide" collimator is activated and is more accurate (only pro cameras have.

To be sellable, photography must be squeaky clean (or truly exceptional). Those guys already have 99% of the pictures you take in stock...

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Aug 3, 2012, 17:26
Post: #3
RE: Negative
Thanks for the info on making a jpeg into a negative, I'll give it a go and see what I come up with. Also, and this might be beyond Gimp but I'll ask on the off chance, would it be possible to make the negative image so that when a cursor was passed over it it changed to the full colour jpeg image or would I need to use some other program for the job?

Cheers for the tips on the camera focus. I'm still messing around with it, trying to see what looks good and what doesn't, and what difference all the different settings make. I've set off on quite a journey this time.

As to selling stuff, those guys really have seen most everything before. Still, I got some encouraging feedback so it's an avenue to explore whilst I learn about the camera.

Cheers.

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Aug 3, 2012, 19:38
Post: #4
RE: Negative
(Aug 3, 2012 17:26)caz Wrote:  Thanks for the info on making a jpeg into a negative, I'll give it a go and see what I come up with. Also, and this might be beyond Gimp but I'll ask on the off chance, would it be possible to make the negative image so that when a cursor was passed over it it changed to the full colour jpeg image or would I need to use some other program for the job?
Gimp won't do, but this is classical HTML trickery.

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Aug 4, 2012, 10:45
Post: #5
RE: Negative
Quote: caz Wrote: Thanks for the info on making a jpeg into a negative, I'll give it a go and see what I come up with. Also, and this might be beyond Gimp but I'll ask on the off chance, would it be possible to make the negative image so that when a cursor was passed over it it changed to the full colour jpeg image or would I need to use some other program for the job?

Gimp won't do, but this is classical HTML trickery.

I thought as much. I'll check out HTML and see what I can find on the subject.

Had a play around with colour/invert last night, it sure throws up some unexpected and appealing colour changes. I also added a orange coloured layer and dropped the opacity which gives a more negative look. With more work I should be able to get close to the effect I'm looking for.

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