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RawTherapee plugin
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  Making an image semi-transparent… Or is that semi-opaque?
Posted by: HavingTooMuchFun - 09-25-2018, 04:41 PM - Forum: General questions - Replies (22)

What I’m trying to do is make an entire image SHEER, in other words see-through, but with all the colors maintained. Using the opacity control on the layers palette it looks like I’m doing that, the gray checkerboard appears underlying the image, but when I try to copy or clone that image onto another one, it goes on completely opaque, no matter how low I take the opacity! BUT, if I save the image as a PNG, and re-import it, then it can be copied or cloned and it IS sheer.

Clearly, I’m making some sort of stupid error here; could somebody please tell me what it is, lol?

Also: I’ve tried copying the sheer image into the clipboard of the brush pallete, but the result is also always opaque; is that fixable?

For bonus points: Is there a way to make only PART of an image see-through? Not colorless, just SHEER. Taking a color to alpha sometimes creates exactly that effect, by accident as far as I can tell, because I can’t make it do that deliberately…?!

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  Pixel enlarge
Posted by: al.da.drone - 09-24-2018, 05:43 PM - Forum: General questions - Replies (2)

Hi all, I am trying to get my head around Gimp and graphic software as a whole and clearly I am a bit thick on the subject so I appologise in advance for my question.   I have an image that is 226 x 223 pixels, a website says that is an option in Gimp that will up the quality when I scale it. Low and behold the option isnt available in the Gimp I'm using. I have attached a picture. Is it somewhere else in Gimp?

Thanks



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Lightbulb Bringing out features in an astronomy photo
Posted by: Forge - 09-23-2018, 11:20 PM - Forum: General questions - Replies (6)

Hi all,

Very new user of GIMP here. I have been learning bits from youtube videos and some tutorials from here https://www.gimp.org/tutorials/

The reason I started learning GIMP was because of pictures I take from my telescope, that I wanted to enhance. For example I took a picture of the Pillars of Creation (https://en.wikipedia.org/wiki/Pillars_of_Creation) but I'm struggling to bring out the 3 nebula columns here - https://imgur.com/xSEib3D

Is there a way to increase the contrast between just the 3 'pillars' and the rest of the image?

Thanks in advance

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  Stroke path colour isnt the one I'm selecting
Posted by: al.da.drone - 09-23-2018, 08:04 AM - Forum: General questions - Replies (5)

Hi all

I am strugging with the stroke colour today, I am selecting black as FG I am then stroking the path and it always comes up as a brown/red colour.
Absolutley no idea what is going on. Any ideas ?



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  New Gimper question on Transparent layers
Posted by: StylinLP38 - 09-22-2018, 05:36 PM - Forum: General questions - Replies (2)

Im confused in GIMP the difference between adding an ALPHA channel to a layer or choosing the ADD Transparent Layer to a layer.
Also, when you create a new Layer you have a choice between creating it with WHITE or Transparent. 
Im trying to grasp how to create many layers with a different over land textures so I can create fields, grass, woods, hills, gravel, roads. Its really confusing. 
Why would I choose ADD an ALPHA channel to an existing texture layer vs creating a new transparent layer?

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  Strange results from Display Filters>Clip Warning
Posted by: ajax - 09-22-2018, 04:56 PM - Forum: General questions - Replies (6)

As pretty much of a novice when it comes to digital image editing it seems like the idea of finding the portions of an image where clipping is occurring might be pretty basic.  It looks like this is done via View>Display Filters with the Clip Warning filter active.  I think I understand what Highlights and Shadows are but have no idea when it comes to Bogus Color.  I'd suppose that anything clipped might be considered Bogus.

When reading the help pertaining to Display Filters I find the following:

This filter allows to visualize underexposed and overexposed areas of a photo with user-configurable colors. For now, it’s mostly geared towards images where colors are stored with floating point precision. You will mostly benefit from this, if you work on 16-/32-bit per channel float images such as EXR and TIFF.

This is not very helpful.  Given that I'm working in 16 bit integer precision it comes across as something I ought not be using but surely I should be expected to want to know what is clipped.  How is that reconciled?

Furthermore, the strange results really arise when Clip Warning is Active and then View>Color Management>Soft Proof is also activated.  This seems to have the affect of turning the Magenta color used for out of gamut identification, when Soft Proofing, into Black which of course is a color that is not associated with either Clip Warning or Soft Proofing.  Black is also a pretty bad choice for any such warning since shadows that are NOT clipped include colors that are dark (i.e., nearly if not black).

I'm having a hard time finding any images that show some clipping when the Clip Warning is active.  This is true even though other software such as Rawtherapee does show fairly extensive clipping clipping on some of the same images.  Maybe this is what the documentation meant when saying "For now, ..." but does that also mean DO NOT USE GIMP for my scenario.

My thinking would be that the difference between Soft Proof and Clip Warning is what color profile is applied.  Soft proof should apply the profile associated with a specific choice of printer/paper/ink whereas Clip Warning would apply the profile for my display device which, by the way, has been calibrated.

Any elaboration that helps with the above dilemma will be appreciated.

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  adding Noise to a white layer in 2.10 vs. 2.8
Posted by: Espermaschine - 09-22-2018, 11:41 AM - Forum: Gimp 2.10 - Replies (2)

I can add b/w RGB Noise (with Independent RGB unticked) to a white layer in 2.8 but not in 2.10.

Why is that ?

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  pores
Posted by: something - 09-22-2018, 06:34 AM - Forum: General questions - Replies (6)

hello I'm wondering if gimp is able to add pores simular to how photo shop dose in this YouTube video https://www.youtube.com/watch?v=GUqO2ZQVDp4

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Question Circular text Upside Down
Posted by: KamilBennouna - 09-21-2018, 08:52 PM - Forum: General questions - Replies (5)

Hi guys, new to this forum and to gimp overall.
I was trying to make this logo, and to put a circular text on the upper part of the circle. The problem was that the text kept going on the bottom, and if I rotated it and/or flipped it so it would be on the top, the text would be upside down.

Thanks for the help

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  arrow.scm
Posted by: datashuttle - 09-21-2018, 08:50 PM - Forum: Gimp 2.10 - Replies (2)

Hi,

I have the arrow.scm plugin loaded in the 2.10 plugins directory, but it doesn't show up in the tools menu.

Anyone know why?

Thanks

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