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How to Blacken Up a Grey Image.


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#1 abrogard

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Posted 26 October 2016 - 03:38 AM

It is only a greyscale scan of a sheet of manuscript music.  It is too grey for my liking.  But I can't find a way to improve it.

 

I have tried improving contrast and brightness with a couple of progs but to no avail.

 

I have tried Faststone and I've tried an old copy of PaintShop Pro 6 that I have (and frequently use).

 

And I tried something else that I think came with the computer - win10 I have here - some windows thing I think.

 

There's apparently 172 colors in it.

 

I'll put it up on the web somewhere so's you can try it out for yourselves but meanwhile just asking in case it is a frequent problem and there's a common easy fix.

 

I tried reducing it to 2 colors in PSP but it came out patchy - like broken lines.

 

Here it is:  https://i.imgsafe.org/06c8c11f98.jpg


Edited by abrogard, 26 October 2016 - 03:44 AM.


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#2 Platypus

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Posted 26 October 2016 - 05:43 AM

Tried a little tweaking with Irfanview, did this end up dark enough?:

https://i.imgsafe.org/0885a5fdd1.jpg

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#3 abrogard

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Posted 26 October 2016 - 02:29 PM

Well it is an improvement, that's for sure.

 

But you be the judge.  Here's the original, your improvement and what I normally get as scans of pages (in psp).

 

https://i.imgsafe.org/10390334ca.jpg



#4 Havachat

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Posted 27 October 2016 - 02:35 AM

Clean the Platten Glass on the Scanner , Raise the DPI.

The Original { On the Left Side - 1gif } has a White Background , so any Scans should show it as White , and not that light Blue / Grey as Uploaded.

My Old Canoscan 10 yrs old , copies whatever i put in perfectly , at 300 dpi.

So if you scan to quick { Low Dpi } = Poor Scan Image.



#5 abrogard

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Posted 27 October 2016 - 04:08 AM

Clean the Platten Glass on the Scanner , Raise the DPI.

The Original { On the Left Side - 1gif } has a White Background , so any Scans should show it as White , and not that light Blue / Grey as Uploaded.

My Old Canoscan 10 yrs old , copies whatever i put in perfectly , at 300 dpi.

So if you scan to quick { Low Dpi } = Poor Scan Image.

 

Yep, I hear what you're saying and you're ontrack for cause.

 

That scanner actually produced a whiff of magic smoke yesterday and is now a corpse.

 

Doubtless there's the original sin.

 

But that leaves us still with the task:  to make this image black and white.   Is this beyond such modern technology as is relatively freely available to us?



#6 gedstar

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Posted 27 October 2016 - 05:24 AM

How's this

 

http://www.mediafire.com/view/h2ac9d6w0994att/06c8c11f98dark.jpg


Edited by gedstar, 27 October 2016 - 05:38 AM.


#7 abrogard

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Posted 27 October 2016 - 02:29 PM

I'd say that falls short of perfect by the narrowest margin, wouldn't you?

 

Can you reveal how you managed to do it?

 



#8 gedstar

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Posted 28 October 2016 - 03:56 AM

Yeah no worries

 

I used a Levels Adjustment Layer in Photoshop

 

http://www.mediafire.com/view/7fvfbdyoc2r30yx/PS.jpg



#9 abrogard

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Posted 28 October 2016 - 04:18 AM

Ah,  thank you.  I don't have Photoshop so I used GIMP.  Got the same result, I think.  Lovely.  Thanks again.  https://i.imgsafe.org/3175f02997.jpg






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