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256 Colour palettes for Photoshop |
Ko
Joined: Apr 12, 2003
Posts: 43
From: North California
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Yes @ jken8
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maddav
Joined: Dec 01, 2002
Posts: 356
From: Nottingham, UK
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Okay, i've been trying to create some backgrounds using Paint Shop Pro 5, and i've come up with the following, original on the left, conversion on the right.
Direct link to image: http://theringofpower.bravepages.com/t68psptest.gif
As you can tell, i've been having some problems with the conversion, i'm using the T68 colour palette, and following all8's guide for Contrast etc. But my images still turn out somewhat pixelated, which is especailly noticeable in the Gandalf pic (2nd from bottom) because of the light. Can anyone help me get round this problem?
[ This Message was edited by: laffen on 2003-07-07 10:09 ] |
binoblaine05
Joined: Mar 30, 2003
Posts: 480
From: HOGWARTZ
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good pm peeps... |
simonboyes
Joined: Apr 06, 2003
Posts: 10
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WARNING, STOP PRESS ETC.
I use Paint Shop Pro 7, which uses .pal files as palettes instead of .act files, and so I cannot say for certain that all8's 256.act file is incorrect. However, the 'Count Colours Used' function of PSP reveals that PortfolioT68.gif (which all8 says was created using that palette file) DOES NOT FEATURE 256 COLOURS. Close inspection of the image shows that a couple of colours are duplicated in the bright area on the right.
I see that all8 has determined that the t68/t300 can display 8, distinct, equally-spaced levels for each of red and green and 4 distinct blue levels and used this information to create this (excellent) palette. Fortunately, things can be corrected easily by checking over the pattern in PortfolioT68.gif that all8 has followed and then exporting the palette again.
I apologise to all8 in advance if this anomaly does not appear in 256.act.
### You can verify for yourself that 8 levels of red and green and 4 of blue are used by these phones by drawing an image consisting of three gradients. At the top of the image create a gradient from black (RGB 0,0,0) to red (RGB 255,0,0); in the middle a gradient from black to green (RGB 0,255,0); and at the bottom a gradient from black to blue (RGB 0,0,255). When displayed on the phone's screen, the red and green gradients are split into 8 equally-spaced stripes, while the blue is split into just 4. It just so happens that 8*8*4=256. The human eye is less sensitive to variations in the luminance of blue light, which, presumably, prompted the decision to assign the '4' to blue.### |
all8
Joined: Feb 28, 2002
Posts: 372
From: Malaysia
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oops
>simonboyes is right, there are some anomalies in the original portfolioT68.gif file. I've corrected it on 5-8-03 and reposted to esato.
>simonboyes, please double check with paint shop, thks.
For those who are using .act file for photoshop . Let me assure you it contained 256 colours coz i used a different picture to generate it
You may find the anomalies in the original portfolioT68.gif as the picture below
The corrected below
[ This Message was edited by: all8 on 2003-05-07 19:19 ] |
simonboyes
Joined: Apr 06, 2003
Posts: 10
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@all8
You know, I created almost exactly the same numbered image as the one above, to help to prove my point! I was about to say that you missed the two duplicated tones around the middle left (7 from the right and 4&3 from the bottom), but I see that you've corrected them in the bottom image.
Thanks for checking up on what I said - I thought I'd embarrassed myself, for a minute, there...
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simonboyes
Joined: Apr 06, 2003
Posts: 10
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Here's where I get under everybody's skin again (especially all8's):
I don't suppose anyone has tried the ActiveX Mophun emulator, at www.mophun.com ? The colours used by that are ever-so-slightly different to those in these pallettes, but I've no idea if they're what the SE screens can display or simply what Mophun works with.
Can anyone find a definitive pallette!?  |
simonboyes
Joined: Apr 06, 2003
Posts: 10
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Serious flaws in my personality (which I plan to consult my doctor about) have led me to generate this list of distinct values that are taken by red/green/blue, as seen in all8's palette and in screen grabs from the Mophun emulator:
ALL8'S PALLETTE
Red/Green: 0, 37, 73, 110, 146, 183, 219, 255
Blue: 0, 85, 170, 255
MOPHUN EMULATOR
Red/Green: 0, 33, 74, 107, 148, 181, 222, 255
Blue: 0, 82, 173, 255
Here's where I become REALLY unpopular: if the levels are meant to be distributed evenly between 0 and 255 (which would make more sense), then they ought to be as follows:
Red/Green: 0, 36, 72, 109, 145, 182, 218, 255
Blue: 0, 84, 170, 255
all8's palette differs only because the values there scale between 0 and 256 and not 255 (the difference is purely down to rounding off - talk about PEDANTIC).
Should I be proud of myself? Probably not... |
ripkord
Joined: Jun 25, 2003
Posts: 367
From: Glasgow, Scotland
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0 is a number, so there are 256, 0 to 255. ya see 
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lewissham
Joined: Aug 06, 2003
Posts: 2
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lewissham
Joined: Aug 06, 2003
Posts: 2
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Can someone teach me how to make a COLOUR TABLE? (.act)
I do need it urgently.
Thx in advance for those good guys!!!
I love u!
>_<
I mean I got to make one for myself, but not for that provided 256.act.
It's like I want to know how to make a colour table, dun tell me to d/l that file and use it, haha.
Becuz I am not using that for my phone.
THANKS A LOT, AND AGAIN!
[ This Message was edited by: lewissham on 2003-08-06 15:56 ] |
GoH
Joined: Jun 23, 2003
Posts: 400
From: somewhere in sg
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ripkord made some good sense there |
aamonster
Joined: Sep 12, 2003
Posts: 1
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You are totally wrong about color values in palette. At least in my t68m (firmware R8A015 - as in t68i) there are another colors.
Just make pictures with red, green and blue gradient 0-255 and you can measure color thresholds. They are:
48, 64, 88, 112, 128, 152, 168 for red and green.
64, 112, 160 for blue.
Ooops... That's not all. It looks like there is non-uniform palette in T68m. It's possible to get it (make pictures with all combinations of 5bit R,G,B, but it's a lot of work...
[ This Message was edited by: aamonster on 2003-09-12 12:23 ] |
simonboyes
Joined: Apr 06, 2003
Posts: 10
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@ripkord
I agree with what you said, but to reiterate my point:
The first value should be 0 and the other seven should be multiples of 255/7, after rounding. The final value is going to be 255 if you do this and there will be a range of 256 from 0 to 255 -
0,36,73,109,146,182,219,255
If, however, you take 0 as the first value and get the other seven from multiples of 256/7 and round them off, the final value will end up being 256. The values will then wrongly range from 0 to 256, a range of 257! -
0,37,73,110,146,183,219,256
Try it with a calcalator yourself.
Observe the differences, then compare the second list of values with those in all8's palette -
0,37,73,110,146,183,219,255
It the same as the ever-so-slightly-wrong list, except for the 255, which appears to be a result of forcing 256 into the acceptible range.
You do know, if my mates down the pub see this display of anal-retention, I'm a dead man? |
Prosody
Joined: Nov 05, 2003
Posts: 122
From: UK
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Quick question.
When I save a .gif image in Photoshop 7 it asks if I want to save it in on of two ways. "Normal" or "Interlaced" I know that they are different ways the pic is put together (in alternating lines or not) but is any of them better than the other and do they both work on a T68i?
I have a T610 but a girl at work wants some Beckham pics (*GROAN*) and I'm the sucker who has to make them for her. 
Any help is appreciated, I've already followed a load of the steps in this thread and the pics seem better on the computer... lets see how they translate to the phone tomorrow. | |
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Posted: 2003-04-12 22:44
