[Qgis-developer] color ramps improvements

[Etienne Tourigny]

Hi,

perhaps you didn't catch the previous discussion on this list (subject
"Raster colours"), or you  didn't read this thread closely. Admittedly the
subject of this thread does not mention cpt-city, but...

This is EXACTLY about using the cpt-city files (although their svg variant)
to make color ramps.

Tomorrow this should be in the linux and windows developpment builds, if
you want to check it out - it is in qgis master git.

Etienne


On Fri, Aug 3, 2012 at 4:29 PM, <pcreso at pcreso.com> wrote:

> How about the ability to import/read/use cpt files from CPT city?
>
> http://soliton.vm.bytemark.co.uk/pub/cpt-city/
>
> There is a huge number of cartographic (& other) colour ramps/palettes for
> users to tap into from many authors & packages.
>
> Providing an easy way for QGIS users to make use of these would be a
> valuable asset.
>
> Cheers,
>
> Brent Wood
>
>
> --- On *Sat, 8/4/12, Paolo Cavallini <cavallini at faunalia.it>* wrote:
>
>
> From: Paolo Cavallini <cavallini at faunalia.it>
> Subject: Re: [Qgis-developer] color ramps improvements
> To: "Etienne Tourigny" <etourigny.dev at gmail.com>
> Cc: "qgis-developer" <qgis-developer at lists.osgeo.org>
> Date: Saturday, August 4, 2012, 3:16 AM
>
> Il 03/08/2012 16:52, Etienne Tourigny ha scritto:
> > is there an existing infrastructure for this in qgis/qt to do the
> following?
> >
> > 1) download the file
> > 2) unzip - I have added the GDAL funcitons to read zips, but not sure
> > if it's easy to unzip a file.
> quite the same as for plugins: I guess having the same widgets for
> installing plugins, styles, and ramps would be a great plus, both for
> users and for developers.
> > where would you get the metadata from? There is metadata for author,
> > group, but not for each gradient. Do you mean the gradient name?
> yes, name is often descriptive enough - when not, we can probably add tags?
> > Someone would have to step in, select a few and propose them. These
> > would be part of the symbols available by default.
> ok, let's start:
> - at least one DEM
> - one batymetry
> - a red, a green,and a blue scale
> - one "semaphore" (green to red through yellow)
> - two other diverging
> - more?
> Maybe we could make a poll? I'm sure specific sectors have their
> requirements.
>
> NB: palettes with transparency are not previewed in a meaningful way.
> >
> > I think that this will be easier once Arun's work on symbology
> > grouping and "social styles" is merged.
> agreed - see my other thread on GSoC, who was triggered by this issue.
> > Are you talking about clutter in the style manager or the cpt-city
> > dialog?
> in the style manager: we have now a long list of gradients, and the New
> ramp entry could be easily overlooked.
> > If the latter - In this case you have about 3-4 groups which are
> > duplicated, out of more than 100, so I don't see how it adds to
> > clutter. I thought about removing the ColorBrewer option(as they are
> > available in cpt-city), but it is still relevant because there are
> > fewer options to choose from and it is simpler (and nicer) to work with.
> I think adding only the default ones (see above), and letting the users
> build the others, should be ok.
> > This topic is more related to how the gradient is applied to the
> > raster/vector, so this sort of lies outside of the cpt-city dialog (I
> > think) - unless those classification methods are tied to specific
> > gradients?
> some of them yes. some gradients should be applied on absolute numbers,
> not relatively (e.g. slopes, DEM).
> >
> > Another functionality from 1-band plugin that is missing is the
> > possibility to invert colors and palette. This would be very useful,
> > but should it be inside the style manager or in the vector/raster
> > layer dialogs?
> IMHO, in the layer dialog.
> >> - the raster layer property dialog should be made more clear, and more
> >> homogeneous with that of vectors.
> > I agree - perhaps you can submit a mock-up?
> perhaps someone with better designing skills is more suitable.
> IMHO the default interpolation should be linear, not discrete.
> >> One more: I think the default listing should be by theme, not by author.
> > hmm do you mean the selection view? Because aside from that there is
> > no "theme" grouping yet.
> I mean in the cpt-city color ramp dialog (View is by default switched to
> All by author, should be Selections by theme?)
> All the best.
>
> --
> Paolo Cavallini - Faunalia
> www.faunalia.eu
> Full contact details at www.faunalia.eu/pc
> Nuovi corsi QGIS e PostGIS: http://www.faunalia.it/calendario
>
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