Re: [Gimp-user] Pure black n white with smooth curves

[Frank Turk <frank iturk com>]

It also occurs to me you might want to try this approach:

http://gimp-university.blogspot.com.es/2014/03/x-hatch.html


On Fri, Apr 27, 2018 at 1:56 AM ociebieda <forums gimpusers com> wrote:

> I am already using gimp for years, not professionally, but I know most
> basics.
> I also already used google to find proper solution, but all tutorials are
> not
> exactly about what I need, so please do not send me links about simple
> black n
> white or greyscale conversions.
>
> What I need is to convert colored image to almost pure black n white
> effect with
> smooth curves.
> I am not talking about greyscale with "desaturate" or 2 color with
> "threshold".
>
> Original image in lossless PNG.
> It has various colors that I want to remove, not making them greyscale.
> https://speedstar.itos.pl/gimp/gimp-original.png
>
> Method 1.
> I use "threshold" with value 160, which is close to what I am looking for,
> but
> the problem is that it makes image pure 2 color, and all curves are not
> smooth,
> making no shades between black and white pixels (use pixel perfect zoom
> withot
> blurring filters if you are not sure what I am talking about).
> https://speedstar.itos.pl/gimp/gimp-threshold_160.png
>
> Method 2.
> I use "desaturate" with "average" setting, make duplicate and set layer
> mode to
> "dodge", which keeps smooth curves and nicely removes most filling colors,
> but
> there are grey fogs that can be noticed on chest, upper leg, and shoe.
> https://speedstar.itos.pl/gimp/gimp-desaturate_average_layer_dodge.png
>
> Method 3.
> I use "desaturate" with "average" setting, increase gamma (not brightness,
> because I do not want to touch black color) with "levels" with value 160,
> increase "contrast" to value 96 (127 makes image 2 color), but I am still
> getting grey fogs slightly on chest and noticeably on upper leg, and also
> some
> lines become too small.
>
> https://speedstar.itos.pl/gimp/gimp-desaturate_average_levels_160_contrast_96.png
>
> Method 4.
> I use "color to alpha" on all colors, make duplicate and set layer mode to
> "dodge", which seems to to have better effect than previous methods, but I
> am
> still getting grey fogs that can be noticed on chest, and if I use another
> duplicate and set layer mode to "dodge", then lines become too small.
> https://speedstar.itos.pl/gimp/gimp-all_colors_alpha_layer_dodge.png
>
> Any ideas?
> Thanks for any suggestions, and please, lets discuss it like intelligent
> adults,
> no useless comments, no childish behaviors.
>
>
> --
> ociebieda (via www.gimpusers.com/forums)
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