• Andy Balba (22/22) Aug 11 2020 Found this 2012 Forum post :
• aberba (5/14) Aug 12 2020 Recommended to someone and it was well liked. Thanks for doing
• Andy Balba (15/31) Aug 12 2020 gif image format is not supported at all, only png, bmp, tga and

Andy Balba <pwplus7 gmail.com> writes:

Found this 2012 Forum post : 
https://forum.dlang.org/post/jrklsj$2lt9$1 digitalmars.com
and thought that D-folks interested in this topic may find an 
"update" helpful.

FWIW here's my contribution to such an update (others obviously 
appreciated):

https://code.dlang.org/packages/imageformats
has a very quick learing curve and allows easy extraction all 
code related to encoding and decodeing PNG images into a single 
module.
The PNG code handles 8- and 16-bit color depths, gary colors, 
gray+alpha, RGB and RGBA. This code also offers en- and de-coding 
of BMP and TGA, and de-coding only of JPEG; but my interest is 
PNG only.

To this extracted module I've added other modules /functions for :
* commonly used color transformation functions e.g. 
rgb_to_ycbcr(), RGB_to_gray(), wave_length_nm_to_rgb()
* various RGB color-maps
* a Cartesian system that transforms 2D X-Y Cartesian 
co-ordinates into xy screen coordinates allowing one to create 
images using X-Y instead of screen co-ordinates
* several utility functions

aberba <karabutaworld gmail.com> writes:

On Tuesday, 11 August 2020 at 18:29:28 UTC, Andy Balba wrote:
 Found this 2012 Forum post : 
 https://forum.dlang.org/post/jrklsj$2lt9$1 digitalmars.com
 and thought that D-folks interested in this topic may find an 
 "update" helpful.

 [...]

Recommended to someone and it was well liked. Thanks for doing 
this.

It seems getting image dimensions for .gif files isn't supported 
though. Or is it that .gif files aren't supported at all?

   // format specific functions
   PNG_Header hdr = read_png_header("peruna.png");
   IFImage i3 = read_jpeg("porkkana.jpg");
   write_tga("porkkana.tga", i3.w, i3.h, i3.pixels);

Andy Balba <pwplus7 gmail.com> writes:

On Wednesday, 12 August 2020 at 21:59:20 UTC, aberba wrote:
 On Tuesday, 11 August 2020 at 18:29:28 UTC, Andy Balba wrote:
 Found this 2012 Forum post : 
 https://forum.dlang.org/post/jrklsj$2lt9$1 digitalmars.com
 and thought that D-folks interested in this topic may find an 
 "update" helpful.

 [...]

 Recommended to someone and it was well liked. Thanks for doing 
 this.

 It seems getting image dimensions for .gif files isn't 
 supported though. Or is it that .gif files aren't supported at 
 all?

   // format specific functions
   PNG_Header hdr = read_png_header("peruna.png");
   IFImage i3 = read_jpeg("porkkana.jpg");
   write_tga("porkkana.tga", i3.w, i3.h, i3.pixels);


gif image format is not supported at all, only png, bmp, tga and 
jpeg.
For jpeg only decoding is supported.

When generating my own image files, I prefer to stick with png 
format.
Non-png formatted images that I obtain from external sources, 
fall into two categories:
- those I only want to view i just pass on to image viewer 
software.
- those I want to modify in any way, are first converted to png 
format using on-line image-format converters. Then I work with 
the png file using various C++ apps I previously developed prior 
to my transition to Dlang.

I'm currently converting my most heavily-used C++ apps to D