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| Author |
lightening background on artwork
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| bowler 2007-11-19, 6:21 pm |
| When I take pictures of my ink drawings done on white paper, the white
paper often looks grey, maybe it is the light in my studio. I don't
know, When I take pictures of the paintings, the colors come out fine.
What I would like to do is correct the drawing images to show the
background paper lighter and keep the dark ink drawing as it is. Can
anybody tell me if this is simple enough to give me step by step
instructions?
I only use PSP for just basic resizing of images I take of my
artwork. I really don't work with it very much otherwise. could
somebody just tell me how to do this?
thanks!
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| bowler wrote:
> When I take pictures of my ink drawings done on white paper, the white
> paper often looks grey, maybe it is the light in my studio. I don't
> know, When I take pictures of the paintings, the colors come out fine.
> What I would like to do is correct the drawing images to show the
> background paper lighter and keep the dark ink drawing as it is. Can
> anybody tell me if this is simple enough to give me step by step
> instructions?
> I only use PSP for just basic resizing of images I take of my
> artwork. I really don't work with it very much otherwise. could
> somebody just tell me how to do this?
>
> thanks!
One way for drawings in black and white is to reduce the pallet to 2 bit ie
only white and black
--
Trev
You can always tell a Yorkshire man,
But you can't tell him much.
| |
|
| bowler <bluebowling@yahoo.ca> wrote in news:bbf7c9ea-8d3a-4c5c-80fa-
7eb821ca261d@d50g2000hsf.googlegroups.com:
> When I take pictures of my ink drawings done on white paper, the white
> paper often looks grey, maybe it is the light in my studio. I don't
> know, When I take pictures of the paintings, the colors come out fine.
> What I would like to do is correct the drawing images to show the
> background paper lighter and keep the dark ink drawing as it is. Can
> anybody tell me if this is simple enough to give me step by step
> instructions?
> I only use PSP for just basic resizing of images I take of my
> artwork. I really don't work with it very much otherwise. could
> somebody just tell me how to do this?
>
> thanks!
The white paper comes out grey because your camera is trying to average
exposure over the whole image (i.e., averaging towards middle grey), and
because white is predominant the camera is bringing it more towards the
middle grey, thus the grey cast. Exposing for the white only will cure
that, but may create a lighter color for your ink. Then you could bring
your image into PSP and perhaps adjust the black with the histogram
adjustment. There are likely better ways, and actually the best method
will also depend on your drawing (i.e., is there much shading, or is it
just stark black and white).
Regards,
JoeB
| |
| bowler 2007-11-19, 10:15 pm |
| On Nov 19, 7:19 pm, JoeB <mym...@myserver.com> wrote:
> bowler <bluebowl...@yahoo.ca> wrote in news:bbf7c9ea-8d3a-4c5c-80fa-
> 7eb821ca2...@d50g2000hsf.googlegroups.com:
>
>
>
> The white paper comes out grey because your camera is trying to average
> exposure over the whole image (i.e., averaging towards middle grey), and
> because white is predominant the camera is bringing it more towards the
> middle grey, thus the grey cast. Exposing for the white only will cure
> that, but may create a lighter color for your ink. Then you could bring
> your image into PSP and perhaps adjust the black with the histogram
> adjustment. There are likely better ways, and actually the best method
> will also depend on your drawing (i.e., is there much shading, or is it
> just stark black and white).
>
> Regards,
>
> JoeB
I put a sample up on my friend's web site temporarily -- if you
enlarge it a bit you'll see the lines clearly -- as it is now they are
a bit broken up. do you have a moment to take a look?
http://www.vagabondpages.com/Temp/tempDsc00041.jpg
I tried the suggestion of reducing to two bit but there are several
options for reducing colours -- to grey, red, green, diffused, etc.
and they all come out black. I don't know how to load a palette to
just black and white. I can see that I might have to study this
program if I need to do a lot of black & white images.
| |
| bowler 2007-11-19, 10:15 pm |
| On Nov 19, 7:19 pm, JoeB <mym...@myserver.com> wrote:
> bowler <bluebowl...@yahoo.ca> wrote in news:bbf7c9ea-8d3a-4c5c-80fa-
> 7eb821ca2...@d50g2000hsf.googlegroups.com:
>
>
>
> The white paper comes out grey because your camera is trying to average
> exposure over the whole image (i.e., averaging towards middle grey), and
> because white is predominant the camera is bringing it more towards the
> middle grey, thus the grey cast. Exposing for the white only will cure
> that, but may create a lighter color for your ink. Then you could bring
> your image into PSP and perhaps adjust the black with the histogram
> adjustment. There are likely better ways, and actually the best method
> will also depend on your drawing (i.e., is there much shading, or is it
> just stark black and white).
>
> Regards,
>
> JoeB
HI! this is my second reply -- I just went to the histogram function
and did 'something' and got another image -- a better one --
http://www.vagabondpages.com/Temp/temp2Dsc00041.jpg
I'm not sure if I've reduced the blackness of the lines but it SEEMS
OK. What do you think? It seems pleasing to me. So I have already
started learning about 'histogram' function which I have never looked
at.
| |
|
| bowler <bluebowling@yahoo.ca> wrote in news:dffb18ed-a781-496b-b8f1-
87d6d20091c7@w28g2000hsf.googlegroups.com:
> On Nov 19, 7:19 pm, JoeB <mym...@myserver.com> wrote:
>
> HI! this is my second reply -- I just went to the histogram function
> and did 'something' and got another image -- a better one --
> http://www.vagabondpages.com/Temp/temp2Dsc00041.jpg
> I'm not sure if I've reduced the blackness of the lines but it SEEMS
> OK. What do you think? It seems pleasing to me. So I have already
> started learning about 'histogram' function which I have never looked
> at.
You're on the right track. It looks like you used the Histogram Stretch
function to improve the contrast of the image. You can improve on that
though if you use the Histogram Adjustment tool instead. It's more complex,
but it gives you much better control. As a for instance, try taking your
original image, open the Histogram Adjustment dialog and use the following
settings:
Edit: Luminance
Output max: 255 min: 0
Low: 8 Gamma: 2.00 High: 165
Midtones compress/expand: -14
The Edit setting lets you choose between editing the luminance values of
individual color channels (red/green/blue) within the image, or of the
overall luminance values for the image (by operating on all 3 color
channels equally and simultaneously). For this image, Luminance is what you
wish to work with and the below explanations will refer to it.
The Output levels set the maximum and minimum luminance values that will
be allowed within the image. This is normally called "clipping". In your
image, you want the blacks to be as black as possible (or having a minimum
value of 0) and the whites to be as white as possible (or having a value of
255). When performing overall adjustments on an image with this tool these
settings are normally left at 0 and 255. There are times when other values
can come in quite handy, but (IMHO) they generally occur when you are
trying to develop a mask or other more involved manipulation of the image
and I won't get into that here.
The Low and High values determine the distribution of various luminance
levels throughout the entire image. This is sometimes confusing when people
are just getting started with image manipulations but our goal here is to
"bracket" all of the luminance levels _within the image_ by using the Low
and High settings. For most images, the easiest way to adjust these is to
simply start adjusting the Low number upwards while watching the
corresponding % adjustment right underneath it. Keep increasing the Low
number until you see the % adjustment rise to 0.001%, then back the Low
limit back down until it just turns back to 0.000%. Then do the reverse
with the High setting, reducing it until it's corresponding % reaches
0.001% and bumping it back up until it just returns to 0.000%. If you were
to use just these two adjustments by themselves while leaving all of the
other adjustments at their default values, you would be doing the
equivalent of the Histogram Stretch adjustment that you had found earlier.
Along with the Low and High adjustments is the Gamma adjustment. For
simplicity's sake, think of the Gamma adjustment as an improved
"Brightness" control. It's actions are more sophisticated than the standard
brightness adjustment and (again IMHO) result in much better results 95+%
of the time.
Finally we come to the Midtones compress/expand control. In the same way
that the Gamma control is like an improved brightness adjustment, the
Midtone adjustment is like an improved "Contrast" adjustment.
Hope this helps!
--
Rick Simon rsimon@cris.com
Include "spam(trap)key" somewhere in the
body of any email to avoid spam filters.
| |
|
| bowler wrote:
> On Nov 19, 7:19 pm, JoeB <mym...@myserver.com> wrote:
>
> HI! this is my second reply -- I just went to the histogram function
> and did 'something' and got another image -- a better one --
> http://www.vagabondpages.com/Temp/temp2Dsc00041.jpg
> I'm not sure if I've reduced the blackness of the lines but it SEEMS
> OK. What do you think? It seems pleasing to me. So I have already
> started learning about 'histogram' function which I have never looked
> at.
Enhanced with Black and White points http://www.trevorbowden.co.uk/test2.htm
But Like I side you can also decrease the pallet to 2 bits giving just black
and white then use edge effect to swell the black lines. That will not add
any black to broken lines. If your scanner allows scan as 2bit or Black and
white. not Greyscale or colour this will resolve all lines as black no gray
bits and the paper will come out white this may need saving as a tiff or gif
to get the best Jpeg will lower the effect and a smaller file size to boot
--
Trev
You can always tell a Yorkshire man,
But you can't tell him much.
| |
| bowler 2007-11-20, 6:18 pm |
| On Nov 20, 5:02 am, "Trev" <trevbowdenAT.dsl.pipex.COM> wrote:
> bowler wrote:
>
>
>
>
>
>
>
> Enhanced with Black and White pointshttp://www.trevorbowden.co.uk/test2.htm
> But Like I side you can also decrease the pallet to 2 bits giving just black
> and white then use edge effect to swell the black lines. That will not add
> any black to broken lines. If your scanner allows scan as 2bit or Black and
> white. not Greyscale or colour this will resolve all lines as black no gray
> bits and the paper will come out white this may need saving as a tiff or gif
> to get the best Jpeg will lower the effect and a smaller file size to boot
>
> --
> Trev
> You can always tell a Yorkshire man,
> But you can't tell him much.- Hide quoted text -
>
> - Show quoted text -
Hi Trev -- I am using a photo I took with my digital camera. I think
you are suggesting that I scan this photo as 2bit or black and white.
This is something I will also try. Thanks for the help.
| |
|
| bowler wrote:
> On Nov 20, 5:02 am, "Trev" <trevbowdenAT.dsl.pipex.COM> wrote:
>
> Hi Trev -- I am using a photo I took with my digital camera. I think
> you are suggesting that I scan this photo as 2bit or black and white.
> This is something I will also try. Thanks for the help.
I wasn't I just though you where scanning a Drawing. As You dont say which
PSP you might find the tools in Different places. Open your image and then
go to the image menu. Then down to decrease pallet and pick 2 colour. This
will give a white and black image only no shades of gray.
--
Trev
You can always tell a Yorkshire man,
But you can't tell him much.
| |
|
| bowler <bluebowling@yahoo.ca> wrote in
news:ef607f3d-23b2-4781-87dd-c97879ec4b1f@d61g2000hsa.googlegroups.com:
> On Nov 20, 5:02 am, "Trev" <trevbowdenAT.dsl.pipex.COM> wrote:
>
> Hi Trev -- I am using a photo I took with my digital camera. I think
> you are suggesting that I scan this photo as 2bit or black and white.
> This is something I will also try. Thanks for the help.
Having seen the image and how much white paper there was, your camera
definitely underexposed the white, averaging to mid-grey. You would have
to increase exposure to help correct this.
The histogram adjustment works well, as Rick said, for this kind of
image. The more you move the high (right hand)slider to the left the
whiter the background will be. Moving the left (low limit) slider to the
right will enhance the lines, and the gamma slider can help you fine
tune.
Regards,
JoeB
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