Could i approximate it ? in sRGB ? god but this is a mess :( I don't think the client has any original sRGB artwork
On 9 February 2016 at 22:05, <[email protected]> wrote: > I don’t think it’s a colorspace problem perse – as within normal ranges, > going back and forth between RGB and CMYK isn’t so bad. > > The ultramarine blue in the blacks, might be something very different: > a good print black is not 100% black and 0% C,M,Y each: this would result > in a dark grey. > So ‘designers’ add some of the other colors, up to almost 300% total, to > deepen and tint the black. > A cold deep black with lots of cyan, a warmer black with yellow or... > everyone has his preference for mixing black it seems, and they even give > their blacks fancy names. > > Of course that’s bound to give you trouble going back to RGB – as those > are colors that are far outside the normal gamut of colors. > The other way around, we would call them illegal colors, our pure 100% > primary and secondary colors are among them. > As the others have pointed out, welcome to a world of pain – doing some > print work atm, having to mix and match 3D renders (linear), CMYK artwork, > photographs (srgb), physical parts painted with pantone colors and more, > and going back and forth between 3D and ps/illustrator and pdf - and it is > a minefield. > You have to inform your client that their artwork is purpose made for a > certain printing effect which makes them unfit for other use. > You might be better off scanning/photographing printed artwork or physical > products or ... > > > *From:* Sven Constable <[email protected]> > *Sent:* Tuesday, February 09, 2016 10:38 PM > *To:* [email protected] > *Subject:* RE: Softimage and CMYK > > > Even I don't get why black is ultramrine blue, I think it's not because of > CMYK vs RGB but the embedded color profile. I get pdfs for print all the > time, sometimes I even send CMYK renderings back to them (of course not > rendered in cmyk but converted in PS afterwards and with their color > profile attached). If converted from CMYK to RGB and vice versa I saw only > minimal color shifting. It depends largely on color space and -profile. > Remember CMYK and RGB are color models, not color space nor color profiles. > > > > If you import pdfs into PS, convert them to RGB and CMYK. If you see > significant color changes between both, it'because of the color profiles > that are assigned to CMYK and RGB inside Photoshop. I would just convert > them to RGB and then test different color profiles (Edit->Convert to > Profile). Tick 'Preview' and switch between the different profiles > available. Maybe one of it will crush the blacks. > > That is a bit awful and I agree with Rob, the client should send you > proper files. But it's difficult to say what is proper since 3D is not > print is not film is not reality. In an ideal world they would send you RGB > files with sRGB color profile but I doubt this will ever happen. They > usually work with CMYK from start to finish. > > > > Are these product shots are meant for web or print? If print, they're > possibly correct with black beeing blueish and the client expects the > renderings accordingly …? > > sven > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Sebastien Sterling > *Sent:* Tuesday, February 09, 2016 8:30 PM > *To:* [email protected] > *Subject:* Re: Softimage and CMYK > > > > Basically the client wants a pack shot of thirty or so products, so we > need to model them up and texture them. > > In order to texture them the client sent the original packaging files in > .pdf format, but these where originally destined for print and so they are > CMYK. > > the colors are off, it is most noticeable in the blacks, as they have all > shifted to ultramarine blue. > > I don't know how to fix this, it is pretty baffling, :( > > > > On 9 February 2016 at 19:19, Rob Chapman <[email protected]> wrote: > > aah was part of the DTP revolution first time around with Aldus > products... So I remember a bit about conversion having to get renders to > the printers sometimes and being very disappointed with the blue greys :) > > > > firstly this may help > > > > > > and may explain why the colors changed. some colors simply do not fit > between gamuts and will change regardless. > > > > so you have the CMYK plates and have to match in RGB to render and then > convert back to CMYK again? oof. have you tried regenerating in photoshop > from the separate CMYK and they match the printers provided RGB 0utput? > > > > Photoshop LAB color mode was invented for this no? better off starting > with something super wide gamut really depends on what the printer is using > to convert to RGB with or originally sourced from and what printer profiles > etc eg is it coated or glossy paper , all that palava. > > > > if its one specific pantone color or a few then you are in luck as you can > just render mattes like Mr Wuijster suggested and the printer can easily > spot color these. > > > > good luck matching anything RGB with a printer tho...! > > > > > > > > On 9 February 2016 at 18:49, Rob Wuijster <[email protected]> wrote: > > It's not possible, unless you have the exact profile for the printer it > was finalized for. > And it's weird that black is ultramarine blue in your files. > > Just have them give you RGB's, or give them a ton of mattes so they can > color correct the shit out of it again. > > That's what normally happens over here, as the Photoshop guys seem to like > that workflow ;-) > > Rob > > > > \/-------------\/----------------\/ > > On 9-2-2016 19:35, Sebastien Sterling wrote: > > Trouble is here what i hace is in CMYK from the printers and already > decolored, what should be black if ultramarine blue, am looking or a way to > convert these images back to sRGB and back to what they should look like. > there are lots of tutoriels on how to move from sRGB to CMYK but none for > the reverse. or how to color correct it. > > > > On 9 February 2016 at 18:27, Sven Constable <[email protected]> > wrote: > > CMYK generally is not very well suited for 3d because rendering itself is > RGB. When you convert textures in PS from CMYK to RGB I would use 'relative > colormetric' (color settings->conversion options). > > > > sven > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Sebastien Sterling > *Sent:* Tuesday, February 09, 2016 7:13 PM > *To:* [email protected] > *Subject:* Softimage and CMYK > > > > Hey list, am working on a job with package assets art in CMYK. Soft won't > display them. > > Does softimage not support CMYK ? > > Also, when you move from srgb to CMYK in photoshop there is a color shift. > > is it possible to reverse this process ? > > Sorry for weird noobie questions, am not accustom to working with CMYK in > production. > > is weird. > > > > Geen virus gevonden in dit bericht. > Gecontroleerd door AVG - www.avg.com > Versie: 2016.0.7357 / Virusdatabase: 4522/11592 - datum van uitgifte: > 02/09/16 > > > > > > >
