back alley
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ok, i have to ask, what exactly is a histogram?
joe
joe
T
Todd.Hanz
Guest
A histogram is that graph looking thingy Mike posted above his picture (above), most higher end digital cameras and imaging software, Photoshop, have them. It allows you to see where the shadows and highlights fall within an image. Ideally you would want all that "black mountain" looking area to be in the center between the left and right, not touching the edges. The left side of the histogram is the shadow area of your image, if the black goes all the way past the edge you have lost or blocked up shadow detail, if it goes beyond the right side you have blown highlights. All of this is also subjective to your particular image.
BTW, "black mountain area" is not the technical term, its just easier to explain that way, I didn't want to go techy on you.
Todd
BTW, "black mountain area" is not the technical term, its just easier to explain that way, I didn't want to go techy on you.
Todd
back alley
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thanks todd!
for the record i kinda thought the 'graph looking thingy' was a histogram but i had no idea what it was or how to interpret.
i gotta take a class in photoshop. i have ps 7 and never use it cause it looks like waay to much for me.
joe
for the record i kinda thought the 'graph looking thingy' was a histogram but i had no idea what it was or how to interpret.
i gotta take a class in photoshop. i have ps 7 and never use it cause it looks like waay to much for me.
joe
taffer
void
Joe I got a good PS book years ago and made a world of difference. I think I've probably used 5-10% of what it's written there, so go figure.
There are specific PS books for photography digital treatment, they may be worth a look.
Scala processing is simply too expensive here (around $15) so that sounds interesting, however, has Scala some speficic advantadge when used as B&W negative ?
There are specific PS books for photography digital treatment, they may be worth a look.
Scala processing is simply too expensive here (around $15) so that sounds interesting, however, has Scala some speficic advantadge when used as B&W negative ?
back alley
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oscar, i've seen what look like good books on ps but i am more a hands on kinda guy at first and then it helps to have a book to reference certain things.
joe
joe
T
Todd.Hanz
Guest
Joe,
open an image in photoshop, go to "image", click, go to "adjustments", click, go to "levels", click. There is your histogram of that image, if you'll look under it there are 3 sliders, black, grey, and white. Click and hold on one to slide it left and right, watch your image as you do it. Once you get it where you want, get out of there quick. Here are some links that may help:
http://nebulus.org/index.html?pg=tutorial_ps.asp
about the histogram http://www.nebulus.org/tutorials/2d/photoshop/ps6/
http://www.thinck.com/photoshoptut-2.html
most of everything you'll need is on the web so it's free!!!!, just don't blame me for keeping you up late at night
Todd
open an image in photoshop, go to "image", click, go to "adjustments", click, go to "levels", click. There is your histogram of that image, if you'll look under it there are 3 sliders, black, grey, and white. Click and hold on one to slide it left and right, watch your image as you do it. Once you get it where you want, get out of there quick. Here are some links that may help:
http://nebulus.org/index.html?pg=tutorial_ps.asp
about the histogram http://www.nebulus.org/tutorials/2d/photoshop/ps6/
http://www.thinck.com/photoshoptut-2.html
most of everything you'll need is on the web so it's free!!!!, just don't blame me for keeping you up late at night
Todd
Mike Richards
Well-known
Francisco,
If the banding is not on the transparency, did you try to scan it as a negative and then invert in PS? Just a thought. It amounts to a double inversion, but might work. I'm still waiting for my first lab developed positives, so it's hard for me to judge the banding problem.
BTW, I sent the first two rolls of film to the lab in Miami that sells mailers for about $7 on B&H. The Rodinal processing at home was my 3rd roll. Processing by mail here in Germany using a lab in Munich totals up to about 14 Euro per roll. Don't like to get ripped off, which is why I tried the Miami lab. I don't intend to use commercial positive processing again unless the result is clearly better than home negative processing.
If the banding is not on the transparency, did you try to scan it as a negative and then invert in PS? Just a thought. It amounts to a double inversion, but might work. I'm still waiting for my first lab developed positives, so it's hard for me to judge the banding problem.
BTW, I sent the first two rolls of film to the lab in Miami that sells mailers for about $7 on B&H. The Rodinal processing at home was my 3rd roll. Processing by mail here in Germany using a lab in Munich totals up to about 14 Euro per roll. Don't like to get ripped off, which is why I tried the Miami lab. I don't intend to use commercial positive processing again unless the result is clearly better than home negative processing.
T
Todd.Hanz
Guest
Francisco,
It could also be a banding problem with your scanner, try and turn the slide horizontal and scan again to see if band appear vertically.
Todd
It could also be a banding problem with your scanner, try and turn the slide horizontal and scan again to see if band appear vertically.
Todd
SolaresLarrave
My M5s need red dots!
Thanks for the comments! It turns out that I once had a chance to analize the slide on a lightbox... and yes, the big rollers were present, and that's probably where the banding comes from.
Mike, I'll scan the image again as a negative (and invert it later in PS, right?) and I'll let you know. Needless to say, Todd, I'll try placing it in the scanner again, horizontally this time, although I'm afraid the bands are on the film itself but it's worth trying. I really like that image and it's sad to me not to be able to use it.
Joe, you have PS7? There's a very hands-on book titled Classroom in a book. I got it off eBay for $25 and it comes with a CD. You do the stuff in the CD following the directions in the book. I've learned a number of things doing it that way!
Mike, I'll scan the image again as a negative (and invert it later in PS, right?) and I'll let you know. Needless to say, Todd, I'll try placing it in the scanner again, horizontally this time, although I'm afraid the bands are on the film itself but it's worth trying. I really like that image and it's sad to me not to be able to use it.
Joe, you have PS7? There's a very hands-on book titled Classroom in a book. I got it off eBay for $25 and it comes with a CD. You do the stuff in the CD following the directions in the book. I've learned a number of things doing it that way!
I agree with Todd that it's probably a scanner artifact, especially since the banding is centered around those three bright lights in the image. Good idea to turn the neg and rescan to see if the banding orientation follows the scanner orientation or the film's.