filter naming photoshop -> the GIMP

[Roman Mukhin]

Hello everybody

I'm quite new in GIMP and using sometimes tutorials from photoshop. But I could not find
some GIMP filters that match photoshops filters.

for example photoshop: Filter > Stylize > Diffuse. Any analogue in GIMP?

May be someone knows a website where I could find a matching table or description of the
most useful filters and theirs GIMP analogues?

Thank you for helping and
best regards
Ram

[Joal Heagney]

Welcome to the newsgroup.

In order for us to help out better, it would be best if you could
describe exactly what the photoshop filter does. Often their equivalent
Gimp filter has either a completely different name, or is actually a
tool rather than a filter. If you can describe what the filter does or
what you use it for, we should be able to help.

Happy gimping :)

Joal Heagney

[Roman Mukhin]

Thank you for warm reception at the newsgroup.

I.How could I change color table of indexing color image.

Fire Text tutorial:
* http://www.dreaminfinity.com/tutorials/photoshop/firetext.php
* http://www.insidegraphics.com/photoshop/photoshop_special_effects.asp
Steps to colorize the image
1. IMAGE > MODE > GRAYSCALE
2. MAGE > MODE > INDEX COLOR
3. IMAGE > MODE > COLOR TABLE ("BLACK BODY")

I see for this purpose could be used GIMP Palette "Firecode"
First I convert to grayscale, then generate custom palette [256 colors], but I did not
find how I could replace this palette with "Firecode" to achieve effect.

I know how I cold do the same fire colorization with GIMP "filer > colors > map > gradient
map" (without go to grayscale and indexing color). Bit I wonder is it possible to do the
same effect with changing indexing color table?

II. PS filter that I'm interesting in is "Filter > Stylize > Diffuse"
It does diffusion between background and image.

Here could see effect
http://www.insidegraphics.com/photoshop/photoshop_special_effects.asp
http://members.tripod.com/darrenkong1/Diffuse.htm

Thank you for helping
best regards
Ram

[Joal Heagney]

Roman Mukhin wrote:
> Thank you for warm reception at the newsgroup.
>
> I.How could I change color table of indexing color image.

You have the option of selecting a custom colour palette when you go to
Image -> Mode -> Indexed, but this will only try to match your image to
the closest colours in that palate. If you only have one black colour in
your image, the entire image will be mapped to the "blackest" colour in
the colour palette. Once a colour table is assigned, I don't think Gimp
allows you to map it onto another colour palette.

> Fire Text tutorial:
> * http://www.dreaminfinity.com/tutorials/photoshop/firetext.php
> * http://www.insidegraphics.com/photoshop/photoshop_special_effects.asp
> Steps to colorize the image
> 1. IMAGE > MODE > GRAYSCALE
> 2. MAGE > MODE > INDEX COLOR
> 3. IMAGE > MODE > COLOR TABLE ("BLACK BODY")

I had a look at this tutorial, and it seems that the next step is to
convert the image back into RGB space. For all intents and purposes,
you'd be better doing what you suggest below:

<snip>

> I know how I cold do the same fire colorization with GIMP "filer >
> colors > map > gradient map" (without go to grayscale and indexing
> color). Bit I wonder is it possible to do the same effect with changing
> indexing color table?

Gradient map seems the way to go for this effect.

> II. PS filter that I'm interesting in is "Filter > Stylize > Diffuse"
> It does diffusion between background and image.
> Here could see effect
> http://www.insidegraphics.com/photoshop/photoshop_special_effects.asp
> http://members.tripod.com/darrenkong1/Diffuse.htm

Correct me if I'm wrong, but it seems that diffuse creates a
single-pixelated edge in the top layer? This could be simulated in Gimp
the following way.

1.Select your top layer, and somehow make the edges with a transparent
gradient. Two ways to do this would be:

a. Add a layer mask that is white where your text/object is, and
gradients to black elsewhere.
b. Make sure the shape is in a transparent layer (I.e. only text/object
is opaque.). Select all and hit it with a Gausian Blur.

2. Now set the top layer mode to Dissolve.

What happens is that the transparency of the top layer is dithered so
that you only get 100% transparent, and 100% opaque pixels. You can
adjust this by changing the opacity of that layer up or down.

> Thank you for helping
> best regards
> Ram

Also check out this tutorial, which in my opinion, gives a better fire
effect in the Gimp.

http://www.linuxfocus.org/English/November1999/article112.html

Joal Heagney

[Roman Mukhin]

Hi Joal

Thank you for helping.

You right, the method from this tutorial gives better results.
http://www.linuxfocus.org/English/November1999/article112.html

I'm found a similar tutorial:
http://www.jraleigh.com/gimp-fire-tutorial.html

your "diffuse" algorithm is working as well.

king regards
Roman

[Joal Heagney]

Roman Mukhin wrote:
> Hi Joal
>
> Thank you for helping.
>
> You right, the method from this tutorial gives better results.
> http://www.linuxfocus.org/English/November1999/article112.html
>
> I'm found a similar tutorial:
> http://www.jraleigh.com/gimp-fire-tutorial.html

Hmmm. Not bad. Definatly going into my "scrapbook" directory on my computer.

Joal Heagney