Because of this discussion I release this small utility.

NGFX - ColorFade-Calculator 1.160205.zip

• fade palette to black
• fade palette to white
• fade palette to another palette (crossfading)
• fade palette to a greyscaled one
• save as ASM-include, C-Code and Binary

You can also use Drag&drop..

MD5  2e360790bc3ad6775e605b2a896589b4
SHA1 9ec6719738d281fbe8ebf36dff892cc7859d0aac

NGFX 1.160201.zip

• added option to export converted image in 'image import window'
• removed ColorMode-option in ColorRequester
• updated french language (Elrayzeur)

MD5  a2a53e2cfa0562edf19df910da1a28cb
SHA1 1aaca42df4cdbdcbe340bb91579efaf987d6b804 

 NGFX - ImageGrid and -map Tool 1.160201 (fix).zip

(formerly 'NGFX-ImageGridTool')

• changed GUI & fixed some typos
• file extension will be automatically added
• overwrite prompt
• swap TILEs by drag and drop
• save special MAP-file (*.ngfx-map)

1. load/drop image
2. choose tile-size (16x16 is default)
3. add grid
4. swap tiles by drag and drop
5. save image
6. save mapfile (*.ngfx-map)

1. load/drop image
2. choose correct(!) tile-size
3. load/drop mapfile (*.ngfx-map)
4. reset map & remove grid
5. save image

MD5 9ed76001534af7f97becd028f45c578c
SHA1 060ff747ad654d7f4e058b8ecadb651b10a9023d

Export ROM as image WITH GRID.. this Feature was requested but I dont want to integrate this yet because it's very dirty! Use this Tool to add and remove a 8px- or 16px-grid to any supported image.

• reads: *.bmp;*.jpg;*.png;*.gif"
• write:  *.png
  

NGFX-ImageGridTool.zip

MD5  9863ea9884961834aa7eb56ecb38a77d
SHA1 5fc45f1a3f96592785f53ad0d1018acf98c36164

NGFX.zip (v1.160122)

• FIX: load/edit/save
• Cx: load/edit/save
• SPR: load/edit/save
• SYS: load/edit/save
• LOGO: load

Editing is limited to set a pixel, fill/clear a tile or copy/cut/insert view, if you need real editing capabilities you are able to export and import different formats.

*.NGPAL (32byte), it's a binary palette-file with 16colors, you can use this directly with your code.

NGFX is multilingual, englisch & german are hardcoded. There are also 4 other Languages you can choose from (español, français, italiano, português), these are translated with help from 'freem' and his friends or with google-translator. Feel free to correct this files or rename, edit & share 'template.txt' for your own language.

MD5  b14be21ad418faada74879b250e2d5b3
SHA1 8833b31e2e4e86c8ffcba0ff98eadde16cead880

Because of requests I have added following features:

• Pixel-cursor
• import images of any colordepth (PNG/BMP/JPG/GIF)
• Undo-support

In all these years I wrote different viewers, editors & converters - now I throw everything together and it seems working well! :-)

• PaintShop-like GUI
• full drag&drop support (drop any suported file to open)
• "open with.." support (just click a supported file to open with NGFX)
• each window has its own palette, editor included
• drop saved palette (32byte bin) to selected window to change colors
• copy content from one window to another
• export and import content as 16color (indexed) bitmap (*.bmp)
• multilanguage
• ..

supported files:

• NeogeoCD.spr (open, edit, save, save as Neogeo.c*)
• Neogeo.c* (open, edit, save, save as NeoeoCD.spr)
• Neogeo/NeogeoCD.s1 (open, edit, save)
• NeogeoCD 'TITLE_*.SYS' (open, edit, save)
• NeogeoCD 'LOGO_*.PRG' (open and animate)

Finally... because of requests I compiled a Neo Geo CD-version of my twister-intro. Burn and enjoy on real hardware only - real hardware exclusive because no ngcd-emulator is close enough! :-(
It's (again) an AIO-file, there are no separate Files for fix, sprites, z80 or pcm... all needed data is inside the prg-file and uploaded by bios.

twister_in_a_mirror-intro-ngcd.zip

Update: works with MESS.. I never tested this but seems logical because MESS shares code with MAME and ROM works in MAME.

Because of this question and this wiki-page I have done some tests with MAME & real hardware, modifying VRAM-buffer to change spriteorder while drawing is possible but it have to be done every scanline (depending if even or odd) and it's very slow... not usable ingame!

My first release after 10years... it's a simple oldschool intro, a twister in front of a moving transparent mirror with a sinescroller and a short chiptune loop.

twister_in_a_mirror-intro.zip

Runs with USB-2-NEO on real hardware or in latest MAME as "Puzzle de Pon".

202-c1.c1 [72CEED51]
202-c2.c2 [27DA57EE]
202-m1.m1 [C1C27B33]
202-p1.p1 [514BF0FD]
202-s1.s1 [111EA86C]
202-v1.v1 [0C5E044C]