RE: digital imaging question
On 9 Jan 2004 at 14:05, J. C. O'Connell wrote: > I do that too, but I am talking about when you > capture/scan the original. Not what you do to > it afterward. Try to modify the contrast in order to stretch the histogram in the scanner software or camera. If this is not possible then bias the exposure towards the right of the histogram (almost saturate) as you'll likely end up with less noise in your shadows when you adjust levels. Rob Studdert HURSTVILLE AUSTRALIA Tel +61-2-9554-4110 UTC(GMT) +10 Hours [EMAIL PROTECTED] http://members.ozemail.com.au/~distudio/publications/ Pentax user since 1986, PDMLer since 1998
Re: digital imaging question
the Nikon 4000ED has autoexposure and i find that with Provia 100F, i have never had to override it. with Velvia, i sometimes have had to add some exposure to get extra shadow detail and let the highlights go a little. Herb - Original Message - From: "Dag T" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, January 09, 2004 5:09 PM Subject: Re: digital imaging question > It depends on the film. I certainly would with Velvia, but I´ve never > used it. The films I´ve used most, Provia 100F and Agfa 50 RSX are > neutral and easy to scan with this scanner, which has a very good Dmax. > > As it hits on target in most cases I scan in normal 16bit mode first. > Afterwards I see if the highlights and shadows are good compared to the > original. If they are, all the details from the film is in the scan, > and I can do the rest in Photoshop. If not, I adjust the scan.
Re: digital imaging question
It depends on the film. I certainly would with Velvia, but I´ve never used it. The films I´ve used most, Provia 100F and Agfa 50 RSX are neutral and easy to scan with this scanner, which has a very good Dmax. As it hits on target in most cases I scan in normal 16bit mode first. Afterwards I see if the highlights and shadows are good compared to the original. If they are, all the details from the film is in the scan, and I can do the rest in Photoshop. If not, I adjust the scan. DagT På 9. jan. 2004 kl. 22.29 skrev J. C. O'Connell: You dont set the exposure level during scanning? I certainly do. JCO -Original Message- From: Dag T [mailto:[EMAIL PROTECTED] I rarely do anything during scanning. Only of the slide is particularly difficult, but Provia 100F is a very easy film to scan with the Minolta Elite II, so it doesn´t happen often. As I scan in 16bit Photoshop has enough information to work on later. DagT På 9. jan. 2004 kl. 20.05 skrev J. C. O'Connell: I do that too, but I am talking about when you capture/scan the original. Not what you do to it afterward.
RE: digital imaging question
I do that too, but I am talking about when you capture/scan the original. Not what you do to it afterward. J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com -Original Message- From: Dag T [mailto:[EMAIL PROTECTED] Sent: Friday, January 09, 2004 1:05 PM To: [EMAIL PROTECTED] Subject: Re: digital imaging question I always try to stretch the scale so that the image contains both areas being close to the lightest and darkest values. Anything else will often seem grey. It´s the same thing I do in the darkroom, it is done by controlling both contrast and the overall exposure. In Photoshop I use the curve tool. DagT På 9. jan. 2004 kl. 18.13 skrev J. C. O'Connell: > I have a question concerning digital capture (scanning or digital > photography) > that need answering. If I have a scene or negative that has a contrast > range > that it less than the sensor/scanner ( i.e. the histogram width is > narrower > that the histogram width range), is it better to: > > 1. center the recorded histogram > 2. bias the histogram towards the lighter tones taking care not >no clip any highlights > 3. bias the histogram towards the darker tones taking care not >to clip any of the darker/black tones > > I have a feeling the correct way is #2 or possibly #1 but I am not > sure. > Anyone know? > > --- > - >J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com > --- > - >
Re: digital imaging question
You can, but in any case, use an adjustment layer. Some people feel that Levels is more "destructive" than curves to an image, others feel that curves gives better control. I don't know about the first (not sure even what is meant by destructive in this sense), but the later shouldn't matter if you get the result you want. Frits Wüthrich wrote: > Why not use levels for that? > > On Fri, 2004-01-09 at 19:04, Dag T wrote: > > I always try to stretch the scale so that the image contains both areas > > being close to the lightest and darkest values. Anything else will > > often seem grey. It´s the same thing I do in the darkroom, it is done > > by controlling both contrast and the overall exposure. In Photoshop I > > use the curve tool.
Re: digital imaging question
A nice thing in Photoshop is that there are many ways to achieve the same. It´s just a matter of preferences, I like the kind of control the curves give, probably because it was the first tool I learned. DagT På 9. jan. 2004 kl. 19.31 skrev Frits Wüthrich: Why not use levels for that? On Fri, 2004-01-09 at 19:04, Dag T wrote: I always try to stretch the scale so that the image contains both areas being close to the lightest and darkest values. Anything else will often seem grey. It´s the same thing I do in the darkroom, it is done by controlling both contrast and the overall exposure. In Photoshop I use the curve tool. DagT På 9. jan. 2004 kl. 18.13 skrev J. C. O'Connell: I have a question concerning digital capture (scanning or digital photography) that need answering. If I have a scene or negative that has a contrast range that it less than the sensor/scanner ( i.e. the histogram width is narrower that the histogram width range), is it better to: 1. center the recorded histogram 2. bias the histogram towards the lighter tones taking care not no clip any highlights 3. bias the histogram towards the darker tones taking care not to clip any of the darker/black tones I have a feeling the correct way is #2 or possibly #1 but I am not sure. Anyone know? - -- - J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com - -- - -- Frits Wüthrich <[EMAIL PROTECTED]>
Re: digital imaging question
Why not use levels for that? On Fri, 2004-01-09 at 19:04, Dag T wrote: > I always try to stretch the scale so that the image contains both areas > being close to the lightest and darkest values. Anything else will > often seem grey. It´s the same thing I do in the darkroom, it is done > by controlling both contrast and the overall exposure. In Photoshop I > use the curve tool. > > DagT > > På 9. jan. 2004 kl. 18.13 skrev J. C. O'Connell: > > > I have a question concerning digital capture (scanning or digital > > photography) > > that need answering. If I have a scene or negative that has a contrast > > range > > that it less than the sensor/scanner ( i.e. the histogram width is > > narrower > > that the histogram width range), is it better to: > > > > 1. center the recorded histogram > > 2. bias the histogram towards the lighter tones taking care not > >no clip any highlights > > 3. bias the histogram towards the darker tones taking care not > >to clip any of the darker/black tones > > > > I have a feeling the correct way is #2 or possibly #1 but I am not > > sure. > > Anyone know? > > > > --- > > - > >J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com > > --- > > - > > > > -- Frits Wüthrich <[EMAIL PROTECTED]>
Re: digital imaging question
I always try to stretch the scale so that the image contains both areas being close to the lightest and darkest values. Anything else will often seem grey. It´s the same thing I do in the darkroom, it is done by controlling both contrast and the overall exposure. In Photoshop I use the curve tool. DagT På 9. jan. 2004 kl. 18.13 skrev J. C. O'Connell: I have a question concerning digital capture (scanning or digital photography) that need answering. If I have a scene or negative that has a contrast range that it less than the sensor/scanner ( i.e. the histogram width is narrower that the histogram width range), is it better to: 1. center the recorded histogram 2. bias the histogram towards the lighter tones taking care not no clip any highlights 3. bias the histogram towards the darker tones taking care not to clip any of the darker/black tones I have a feeling the correct way is #2 or possibly #1 but I am not sure. Anyone know? --- - J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com --- -
RE: digital imaging question
The answer to your questions could vary with each individual image. Play with it and see what you like. Len --- * There's no place like 127.0.0.1 From: "J. C. O'Connell" <[EMAIL PROTECTED]> Reply-To: [EMAIL PROTECTED] To: <[EMAIL PROTECTED]> Subject: digital imaging question Date: Fri, 9 Jan 2004 12:13:52 -0500 I have a question concerning digital capture (scanning or digital photography) that need answering. If I have a scene or negative that has a contrast range that it less than the sensor/scanner ( i.e. the histogram width is narrower that the histogram width range), is it better to: 1. center the recorded histogram 2. bias the histogram towards the lighter tones taking care not no clip any highlights 3. bias the histogram towards the darker tones taking care not to clip any of the darker/black tones I have a feeling the correct way is #2 or possibly #1 but I am not sure. Anyone know? J.C. O'Connell mailto:[EMAIL PROTECTED] http://jcoconnell.com _ Enjoy a special introductory offer for dial-up Internet access limited time only! http://join.msn.com/?page=dept/dialup
Re: digital imaging question
On Fri, 9 Jan 2004, J. C. O'Connell wrote: > is it better to: > > 1. center the recorded histogram > 2. bias the histogram towards the lighter tones taking care not >no clip any highlights > 3. bias the histogram towards the darker tones taking care not >to clip any of the darker/black tones > > I have a feeling the correct way is #2 or possibly #1 but I am not sure. > Anyone know? According to links that were posted here last week #2 is the best since the sensor is linear, while the "f stop" light measure is logaritmic. "If you do not use the right-hand fifth of the histogram for recording some of your image you are in fact wasting fully half of the available encoding levels of your camera." http://www.luminous-landscape.com/tutorials/expose-right.shtml anders - http://anders.hultman.nu/
