Re: Converting colorspace of a CGColor
On Apr 4, 2015, at 7:08 PM, Kyle Sluder k...@ksluder.com wrote: The ColorSync API has been deprecated on OS X since 10.6, and has never existed on iOS. Sorry if these questions are dumb but I am dumfounded. In looking at the ColorSync Manager Reference about half of the API has been depreciated but only half. https://developer.apple.com/library/mac/documentation/GraphicsImaging/Reference/ColorSync_Manager/index.html Why isn’t the whole API depreciated? Also if the ColorSync API has been deprecated what does the ColorSync Utility application that ships with OS X Yosemite use? --Richard Charles ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
Sent from my iPhone On Apr 3, 2015, at 10:19 PM, Graham Cox graham@bigpond.com wrote: On 4 Apr 2015, at 1:13 pm, Roland King r...@rols.org wrote: That’s most definitely not what Graham is looking for. He’s looking for a way to convert colours programatically, and cross-platform iOS and OSX (no colorsync on iOS). I meant the ColorSync api (what did you think I meant?) but was not aware iOS did not rely on ColorSync, if you had not already done so, you might look at: https://developer.apple.com/library/ios/technotes/tn2313/_index.html#//apple_ref/doc/uid/DTS40014694-CH1-ACTIVECOLORMGMTCOLORSYNC-HOW_DOES_COLORSYNC_WORK_ That's right. In short, a CG equivalent to -[NSColor colorUsingColorspace:] is what I need why don't you just use cocoa? - I just need to ensure that colours that could originate as grays for example, end up as RGBA colours, since I'm doing work directly on the four components. Converting gray is easy enough actually, if I have to do that myself, but it would be nice if there were a funciton that would work across all possible colorspaces. I thought Id' seen a CG function for this in the past, but I can't remember where I saw it and I may be mistaken. --Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/etaffel%40me.com This email sent to etaf...@me.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
On Sat, Apr 4, 2015, at 03:13 AM, edward m taffel wrote: I meant the ColorSync api (what did you think I meant?) but was not aware iOS did not rely on ColorSync, The ColorSync API has been deprecated on OS X since 10.6, and has never existed on iOS. --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
Sent from my iPhone On Apr 4, 2015, at 9:08 PM, Kyle Sluder k...@ksluder.com wrote: On Sat, Apr 4, 2015, at 03:13 AM, edward m taffel wrote: I meant the ColorSync api (what did you think I meant?) but was not aware iOS did not rely on ColorSync, The ColorSync API has been deprecated on OS X since 10.6, and has never existed on iOS. --Kyle Slude there is a newer version which has been available since then [how should it be otherwise?]: please see the headers. perhaps I was unclear: if a «conversion» is desired, by this I mean a conversion performed by a cmm, one must set it up submit it. on OS X this is via the ColorSync api. i surmise the iOS cmm is the same, or a lighter weight version, of the OS X cmm [if anyone knows more please enlighten us]. unless there is published api for negotiating the OS X cmm, one must write requisite code to perform the conversion or ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/etaffel%40me.com This email sent to etaf...@me.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
On 5 Apr 2015, at 12:19 pm, edward m taffel etaf...@me.com wrote: perhaps I was unclear: if a «conversion» is desired, by this I mean a conversion performed by a cmm That isn't quite what I meant by conversion, though it may well end up doing what I want, at least on the Mac. What I mean is that in order to do some calculations on a colour, I need them to be normalised to a 4-component RGBA format. So If I have a CGColorRef that is in the grayscale colorspace for example, I convert it to RGBA. (for gray that's trivial). For a color in the CMYK colorspace, that's not quite so trivial. But of course converting between colours that are calibrated to a particular CMM is going much further than that, and I'm not really needing that (it would probably be the right thing to do in a calibrated colour environment, but since that's not what exists on iOS, I'm compromising in that results on the Mac would not preserve a particular calibration). Going back a step, I saw this in the documentation for CGGradientCreateWithColors(): colors A non-empty array of CGColor objects that should be in the color space specified by space. If space is not NULL, each color will be converted (if necessary) to that color space and the gradient will drawn in that color space. Otherwise, each color will be converted to and drawn in the GenericRGB color space. This led me to believe that there existed, within the Core Graphics API, a way to perform such a conversion. I also thought I'd recollected seeing one, though I can't recall what code I was working on at the time to find out what I did there. This is available in iOS, so it suggested there is a color conversion API somewhere there. It does also specifically exclude indexed or pattern colorspaces, but that's OK for my needs anyway. It will probably suffice to comment my code such that it's clear that passing in any old CGColorRef is not good enough - it has to match the RGBA colorspace I use (and I can assert that). But ideally it would accept any color and convert it as needed exactly as CGGradient says it does. --Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor—part 2
Sent from my iPhone On Apr 4, 2015, at 9:08 PM, Kyle Sluder k...@ksluder.com wrote: On Sat, Apr 4, 2015, at 03:13 AM, edward m taffel wrote: I meant the ColorSync api (what did you think I meant?) but was not aware iOS did not rely on ColorSync, The ColorSync API has been deprecated on OS X since 10.6, and has never existed on iOS. or link a 3rd party cmm. so, what I meant was: conditionally compile for platform using nscolor on OS X, as you get it for free, do what you have to on iOS. to use CGColor one must still conditionally compile the conversion based on platform: --Kyle Sluder ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/etaffel%40me.com This email sent to etaf...@me.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
On 4 Apr 2015, at 8:13 pm, edward m taffel etaf...@me.com wrote: why don't you just use cocoa? because NSColor isn't available on iOS. Do keep up... --Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
On 4 Apr 2015, at 1:13 pm, Roland King r...@rols.org wrote: That’s most definitely not what Graham is looking for. He’s looking for a way to convert colours programatically, and cross-platform iOS and OSX (no colorsync on iOS). That's right. In short, a CG equivalent to -[NSColor colorUsingColorspace:] is what I need - I just need to ensure that colours that could originate as grays for example, end up as RGBA colours, since I'm doing work directly on the four components. Converting gray is easy enough actually, if I have to do that myself, but it would be nice if there were a funciton that would work across all possible colorspaces. I thought Id' seen a CG function for this in the past, but I can't remember where I saw it and I may be mistaken. --Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
use ColorSync. Sent from my iPhone On Apr 3, 2015, at 8:35 PM, Graham Cox graham@bigpond.com wrote: Is there a way to convert a CGColor to a different colorspace? It's trivial with NSColor, but I want to do the same at the lower CG level to keep the code as portable as possible between iOS and Mac. I'm sure I've done this in the past but I'm just not seeing the right function! --Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/etaffel%40me.com This email sent to etaf...@me.com ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Converting colorspace of a CGColor
On 4 Apr 2015, at 9:38 am, edward m taffel etaf...@me.com wrote: use ColorSync. That’s most definitely not what Graham is looking for. He’s looking for a way to convert colours programatically, and cross-platform iOS and OSX (no colorsync on iOS). I just looked in my library of bits and pieces and found some code which write into a bitmap and reads it out again. I don’t even know when I wrote that, and it’s not used in any of my projects, but I believe that was me converting colours at low-level. Surely there’s a better way (but then again I said ‘surely there is a better way’ when I saw the discussion on whitespace in swift and there hasn’t been one yet). Sent from my iPhone On Apr 3, 2015, at 8:35 PM, Graham Cox graham@bigpond.com wrote: Is there a way to convert a CGColor to a different colorspace? It's trivial with NSColor, but I want to do the same at the lower CG level to keep the code as portable as possible between iOS and Mac. I'm sure I've done this in the past but I'm just not seeing the right function! --Graham ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
