Creating images for the Amstrad - Revision history

Lightforce6128: /* Links */

2025-07-02T23:04:58Z

Links

← Older revision		Revision as of 23:04, 2 July 2025
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	*[http://code.google.com/p/newoldtv/downloads/detail?name=retro_computing_gimp_0.0.5.tar.gz ''Retro Computing GIMP filters''] (Python filters for GIMP to create optionally dithered images for the CPC, Spectrum, BBC Micro, C64, and Apple II)		*[http://code.google.com/p/newoldtv/downloads/detail?name=retro_computing_gimp_0.0.5.tar.gz ''Retro Computing GIMP filters''] (Python filters for GIMP to create optionally dithered images for the CPC, Spectrum, BBC Micro, C64, and Apple II)
	*[https://codeberg.org/lightforce6128/gimp-file-cpp-bin-save](GIMP plug-in to save images in CPC format)		*[https://codeberg.org/lightforce6128/gimp-file-cpp-bin-save ''gimp-file-cpp-bin-save''] (GIMP plug-in to save images in CPC format)

Lightforce6128: /* Links */

2025-07-02T23:02:44Z

Links

← Older revision		Revision as of 23:02, 2 July 2025
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	*[http://code.google.com/p/newoldtv/downloads/detail?name=retro_computing_gimp_0.0.5.tar.gz ''Retro Computing GIMP filters''] (Python filters for GIMP to create optionally dithered images for the CPC, Spectrum, BBC Micro, C64, and Apple II)		*[http://code.google.com/p/newoldtv/downloads/detail?name=retro_computing_gimp_0.0.5.tar.gz ''Retro Computing GIMP filters''] (Python filters for GIMP to create optionally dithered images for the CPC, Spectrum, BBC Micro, C64, and Apple II)
			*[https://codeberg.org/lightforce6128/gimp-file-cpp-bin-save](GIMP plug-in to save images in CPC format)

Morn: /* Sample Python programs for conversion to SCR */

2011-08-16T17:04:13Z

Sample Python programs for conversion to SCR

← Older revision		Revision as of 17:04, 16 August 2011
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	binfile.close()		binfile.close()
	</pre>		</pre>

			==Links==

			*[http://code.google.com/p/newoldtv/downloads/detail?name=retro_computing_gimp_0.0.5.tar.gz ''Retro Computing GIMP filters''] (Python filters for GIMP to create optionally dithered images for the CPC, Spectrum, BBC Micro, C64, and Apple II)

Morn: /* Sample Python program for conversion to SCR */

2011-08-16T16:02:56Z

Sample Python program for conversion to SCR

← Older revision		Revision as of 16:02, 16 August 2011
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	*Save in a format your converter to SCR understands		*Save in a format your converter to SCR understands

	===Sample Python ~~program~~ for conversion to SCR===		===Sample Python programs for conversion to SCR===

	You need to save your image in PPM ASCII format in Gimp for this. Also, Python needs to have NumPy installed. The program will also print the necessary INK statements for BASIC.		You need to save your image in PPM ASCII format in Gimp for this. Also, Python needs to have NumPy installed. The program will also print the necessary INK statements for BASIC.

			The first variant is for MODE 0 images:

	<pre>		<pre>

Morn: /* Sample Python program for conversion to SCR */

2011-08-16T16:02:15Z

Sample Python program for conversion to SCR

@@ Line 60: / Line 60: @@
 import struct
-f = file("cpc3.ppm", "r")           # input file
+f = file("input.ppm", "r")           # input file
-binfile = open('bin3.scr', 'wb')    # output file
+binfile = open('ouput.scr', 'wb')    # output file
 pal = [[0,0,0],[255,255,255]]       # initial palette
@@ Line 165: / Line 165: @@
 	for t in range(48):
 		binfile.write(data)
 </pre>

Morn: /* Sample Python program for conversion to SCR */

2011-08-16T15:53:32Z

Sample Python program for conversion to SCR

← Older revision		Revision as of 15:53, 16 August 2011
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	</pre>		</pre>

	For MODE 1 images, replace the second-to last loop with:		For MODE 1 images, replace the second-to-last loop with:

	<pre>		<pre>

Morn: /* Sample Python program for conversion to SCR */

2011-08-16T15:51:34Z

Sample Python program for conversion to SCR

← Older revision		Revision as of 15:51, 16 August 2011
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	print ik		print ik
			</pre>

			For MODE 1 images, replace the second-to last loop with:

			<pre>
			for cl in range(8): # line in character
			for y in range(ydim/8):
			for x in range(0,xdim,4):
			aa=byte_bin(b[x,y*8+cl])[6:]
			bb=byte_bin(b[x+1,y*8+cl])[6:]
			cc=byte_bin(b[x+2,y*8+cl])[6:]
			dd=byte_bin(b[x+3,y*8+cl])[6:]
			oo=(aa[1]+bb[1]+cc[1]+dd[1] +
			aa[0]+bb[0]+cc[0]+dd[0])
			oo=int(oo,2)
			data = struct.pack("B", oo)
			binfile.write(data)
			data = struct.pack("B", 0)
			for t in range(48):
			binfile.write(data)
	</pre>		</pre>

Morn: /* Converting existing RGB images to the CPC 3-level color palette */

2011-08-16T15:22:34Z

Converting existing RGB images to the CPC 3-level color palette

← Older revision		Revision as of 15:22, 16 August 2011
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	This converts an image to CPC MODE 0:		This converts an image to CPC MODE 0:

	*Maximize saturation (the CPC palette is very saturated, so this will give a better result)		*Maximize saturation ('''Colors > Hue-Saturation'''; the CPC palette is very saturated, so this will give a better result)
	*Scale ~~image~~ to 320xXX (proportional scaling)		*'''Image > Scale Image''' to 320xXX (proportional scaling)
	*Then scale to 160xXX (non-proportional scaling)		*Then scale to 160xXX (non-proportional scaling)
	*Posterize with a setting of 3 levels		*'''Colors > Posterize''' with a setting of 3 levels
	*Convert to CPC palette ('''Image > Mode > Indexed''', select '''Use custom palette''' and point to the CPC color palette file[http://www.cpctech.org.uk/download/gimp.zip]. Also select '''Remove unused colors''')		*Convert to CPC palette ('''Image > Mode > Indexed''', select '''Use custom palette''' and point to the CPC color palette file[http://www.cpctech.org.uk/download/gimp.zip]. Also select '''Remove unused colors''')
	*Check '''Image > Image Properties''' for the number of colors used		*Check '''Image > Image Properties''' for the number of colors used

Morn at 15:17, 16 August 2011

2011-08-16T15:17:31Z

← Older revision		Revision as of 15:17, 16 August 2011
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	* Now Choose 'Show Grid' from the 'View' menu.		* Now Choose 'Show Grid' from the 'View' menu.
	* You may find that you can't see the Grid. If that is the case then go back to 'Configure Grid' and choose a foregound colour with which the grid will be drawn. Click on the 'OK' button to confirm the colour.		* You may find that you can't see the Grid. If that is the case then go back to 'Configure Grid' and choose a foregound colour with which the grid will be drawn. Click on the 'OK' button to confirm the colour.

			===Converting existing RGB images to the CPC 3-level color palette===

			This converts an image to CPC MODE 0:

			*Maximize saturation (the CPC palette is very saturated, so this will give a better result)
			*Scale image to 320xXX (proportional scaling)
			*Then scale to 160xXX (non-proportional scaling)
			*Posterize with a setting of 3 levels
			*Convert to CPC palette ('''Image > Mode > Indexed''', select '''Use custom palette''' and point to the CPC color palette file[http://www.cpctech.org.uk/download/gimp.zip]. Also select '''Remove unused colors''')
			*Check '''Image > Image Properties''' for the number of colors used
			*If they are more than 16 (or whatever maximum you want):
			**Use '''Tools > Selection Tools > By Color Select''' and '''Tools > Color Picker''' to replace the necessary number of colors with others
			**'''Image > Mode > RGB''', then convert to the CPC palette again and check in the info window for the number of colors used
			*Crop to 160x200 if necessary
			*Save in a format your converter to SCR understands

			===Sample Python program for conversion to SCR===

			You need to save your image in PPM ASCII format in Gimp for this. Also, Python needs to have NumPy installed. The program will also print the necessary INK statements for BASIC.

			<pre>
			#!/usr/bin/env python

			# Transform ASCII PPM image to Amstrad SCR file (MODE 0)
			# 2011-08-09

			from numpy import *
			import struct

			f = file("cpc3.ppm", "r") # input file
			binfile = open('bin3.scr', 'wb') # output file

			pal = [[0,0,0],[255,255,255]] # initial palette

			def byte_bin(x):
			r=""
			for n in range(7,-1,-1):
			v=2**n
			if x>=v:
			x-=v
			r+="1"
			else:
			r+="0"
			return r

			v = [0,0,0]
			count = zeros((256))

			f.readline()
			f.readline()
			g = f.readline()
			f.readline()

			xdim, ydim = [int(q) for q in g.split()]

			for y in range(ydim):
			for x in range(xdim):
			for c in range(3):
			g = f.readline()
			v[c] = int(g)
			app = 1
			for n,p in enumerate(pal):
			if p[0]==v[0] and p[1]==v[1] and p[2]==v[2]:
			app = 0
			count[n]+=1
			if app:
			pal.append([v[0],v[1],v[2]])

			for pn,pp in enumerate(pal):
			print pn,pp,int(count[pn])

			f.seek(0)
			f.readline()
			f.readline()
			g = f.readline()
			f.readline()

			b=zeros((xdim,ydim))
			c=zeros((2**14))

			for y in range(ydim):
			for x in range(xdim):
			for c in range(3):
			g = f.readline()
			v[c] = int(g)
			n = -1
			for m,p in enumerate(pal):
			if p[0]==v[0] and p[1]==v[1] and p[2]==v[2]:
			n = m
			b[x,y]=n

			for cl in range(8): # line in character
			for y in range(ydim/8):
			for x in range(0,xdim,2):
			aa=byte_bin(b[x,y*8+cl])[4:]
			bb=byte_bin(b[x+1,y*8+cl])[4:]
			oo=(aa[3]+bb[3]+aa[1]+bb[1] +
			aa[2]+bb[2]+aa[0]+bb[0])
			oo=int(oo,2)
			data = struct.pack("B", oo)
			binfile.write(data)
			data = struct.pack("B", 0)
			for t in range(48):
			binfile.write(data)

			binfile.close()
			ik=""

			for n,p in enumerate(pal):
			v=p[1]//1279 + p[0]//1273 + p[2]//127
			lst= [":ink ", str(n), ",", str(v)]
			ik+= "".join(lst)

			print ik
			</pre>

MacDeath at 01:47, 17 December 2010

2010-12-17T01:47:12Z

← Older revision		Revision as of 01:47, 17 December 2010
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			[[Category:Graphic]]
	<div style="border: 1px solid rgb(228, 222, 222); margin: 0px 0px 5px; padding: 0.5em 1em; background-color: rgb(249, 249, 249);"><center>'''''This article originally came from Kevin Thackers' archive at [http://www.cpctech.org.uk http://www.cpctech.org.uk].'''''</center></div>		<div style="border: 1px solid rgb(228, 222, 222); margin: 0px 0px 5px; padding: 0.5em 1em; background-color: rgb(249, 249, 249);"><center>'''''This article originally came from Kevin Thackers' archive at [http://www.cpctech.org.uk http://www.cpctech.org.uk].'''''</center></div>