On the Road to 3.7

Software G'MIC
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This thread enumerates the list of changes in the G’MIC project since the latest stable version (3.6), until it reaches the next major version 3.7.

New features

  • [stdlib-362] New command pca performs PCA (Principal Component Analysis) on a set of vector-valued samples and eventually projects it in a vector sub-space (with lower dimension). Can be used to determine the orientation of shapes in images, among other things!

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  • [stdlib-362] New command depthmap3d renders a 3D image in an image, as a depth map.

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  • [stdlib-362] New command normalmap3d renders a 3D image in an image, as a normal map.

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  • [stdlib-362] Command math_lib: New function epoch2date() convert an epoch to UTC time.

  • [math-core-363] New functions ‘fft()’ and ‘ifft()’ which computes the Fast Fourier Transform (and its inverse) on image-valued variables.

  • [math-core-362] Make loop variable $% available from the math expression evaluator.

  • [core-362] New builtin command createdir can be used to create directories on the filesystem.

Improvements / Modifications

  • [math-core-363] Function epoch() now computes epoch from UTC time.

  • [math-core-363] Optimized versions of multi-arguments functions min(), max(), argmin(), ... when invoked with only one or two arguments.

  • [math-core-363] Function lerp(a,b,t) now accepts a vector value for t (that has same size as arguments a and b).

  • [math-core-362] Function epoch() now computes epoch from UTC time.

  • [web-363] Added new code samples “Morph Shape”, in the Gallery section of the G’MIC website.

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  • [nn-lib-363] Command nn_nl : L2-normalization activation has been added a a possible nonlinear function.

  • [nn-lib-363] Gradient momentum and weight decay are now implemented for all optimizers (not only adam and adamax).

  • [nn-lib-363] Trainer module has been recoded and is now more flexible, easing the passing of parameters to chosen optimizer and scheduler.

  • [nn-lib-362] Adam optimizer now implements a decoupled weight_decay (AdamW variant).

Bugfixes

  • [core-362] Command object3d: Fix vertice brightness for z-clipped triangles, when Gouraud shading rendering mode is used.
4 Likes
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I guess 3D things will be the focus of G’MIC 3.7?

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No, not particularly. I’m only adding 3D-related commands when I feel there is a need.

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Not sure if a new feature to Packed Ellipses can easily be added but I was wonder if an option for an avoidance mask could be implemented (i.e. have the dots contained in selective regions)? If so, great, if not, I understand, David. :slight_smile:

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You could also use gimp to select regions.

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Not easy, as the initial algorithm has not been designed for that.
I would rather suggest to use the Pack Sprites filter (that allows a mask), with a few ellipses of different ratios as allowed sprites.
Because when packes, the sprites can be rotated/scaled by the packing algorithm, so you’ll get something similar to what Pack Ellipses does.

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That’s cool, David; it’s just Packed Ellipse is so much faster and aesthetically more cool for shaping but maybe I use some of the tricks I use with Packed Ellipse to get Packed Sprites to work like I want it to. :slight_smile:

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2025/09/24: Release of version 3.6.2.