| | <<<Back 1 day (to 2011/08/13) | 2011/08/14 |
| Kunnis | alexcher So when I specify a colorspace for an image, what's actually happening to the image? | 01:11.26 |
| | I know the bits stay the same, but how is a 3/4 color image drawn into a 1 channel spot color space? | 01:17.03 |
| | And how does transparency in the source image affect the output. | 01:36.17 |
| | I'm working with a large varity of pdfs, and I'm needing to create a white underprint layer for printing. | 01:38.00 |
| alexcher | Kunnis: process colrs don't convert to spot colors. I don't really know what you are doing. | 01:40.53 |
| Kunnis | I'm copying the pdf, and I'm setting the colorspace of all the elements and the images to the new spot color. That's going to be put behind the origonal image. | 01:41.51 |
| | What I'm trying to do... I'm working on automatically preparing some pdfs for our printers. I need to create a layer of images that match the current layer, specifiying where I want the printer to print white, so that we can print on clear materials. | 01:43.34 |
| alexcher | Kunnis: You need to draw a rectangle in a spot color and request the overprint feature. | 01:43.50 |
| | Kunnis: Your rectangle should cover the whole image area. | 01:44.18 |
| Kunnis | but here's where it's annoying, with images, some specify transparency.. those should stay transparent and not get the backing white. | 01:44.38 |
| alexcher | Kunnis: You can convert your images to DeviceN color space and add an extra channel. | 01:45.40 |
| Kunnis | I need to create it as a spot color for the printer software. | 01:46.48 |
| | it only detects spot colors in the pdf. | 01:47.07 |
| alexcher | Kunnis: DeviceN can is equivalent to a number of separations drawn sequentially plus a bonus tint transform on a non-conforming device. | 01:48.22 |
| Kunnis | well I tried my idea of copying all the elements (that's easy to do, we do that all the time where I work), and set the colorspace of the images and the elements to the spot colorspace. | 01:49.22 |
| | it seems to work, but I want to understand what's going on to see if it will work for all cases. | 01:49.41 |
| alexcher | Kunnis: if your RIP needs spot colors, add a dummy rectangle in the spot color, but use DeviceN elsewhere. | 01:51.11 |
| | Kunnis: I can check your PDF file and tell, what does it do. | 01:51.45 |
| Kunnis | well I don't control the source PDFs. The sources have a mix of cmyk and rgb images | 01:51.46 |
| | I know what I did, but I don't know why. I took all the images, copied them out, and copied them back in, changing the colorspace to the spot color. | 01:53.11 |
| | I then walk through all the elements, and set their FillColorspace and the... (I forget the other colorspace I set, I'm not in front of the source code right now) to the spot color. | 01:54.19 |
| alexcher | Kunnis: OK, I'd expect that 1/3 of RGBRGBRGB... stream is used as the spot color. | 01:54.30 |
| Kunnis | I wish I could vpn into work and give you the example, but the vpn is broken. | 01:56.01 |
| | That's what I was afraid of. | 01:57.29 |
| alexcher | Kunnis: I'm on this channel most of the time, esp. on weekdays. | 01:57.30 |
| Kunnis | Yeah, using ony one of the channels is kind of what I was afraid of. | 01:59.18 |
| alexcher | Kunnis: I'd expect that the first 1/3 of the interleaved stream will be used. | 02:00.29 |
| Kunnis | I'm trying to understand how the spot colorspace works. I don't understand how the image gets down in that colorspace. | 02:01.19 |
| alexcher | Kunnis: I'm afraid I need to see the file to say something definite. | 02:03.25 |
| Kunnis | fair enough. I'm just trying to understand how colorspaces work with pdfs | 02:03.57 |
| alexcher | Kunnis: Did you try to read the fine PDF manual? | 02:05.21 |
| Kunnis | no, please point me to it! | 02:05.56 |
| alexcher | http://www.adobe.com/devnet/pdf/pdf_reference.html | 02:07.35 |
| Kunnis | I've been reading the manual... but I also realized that I'm not sure our idea about it taking the 1 channel from the image and using it in the spot color was correct. it was a black and white image of a person, on a white background. the output I saw on my monitor was a solid magenta. if it was using a channel from the image (either cmyk or rgb) I would have seen it change across the image. I wish I had it here so you could look | 03:20.03 |
| robin_watts_mac | hey henrys | 15:43.58 |
| henrys | howdy | 15:46.22 |
| | had a close encounter with a moose yesterday while running - they are awesome animals. | 15:48.21 |
| robin_watts_mac | ah. closest I've come to moose has been on the other end of a zoom lens. | 15:48.43 |
| | I have a friend in utah who was waging a running battle with moose in his back garden. Whenever he plants a sapling, they eat it. | 15:49.20 |
| henrys | I had never seen one close in the wild until now, I wouldn't battle a moose without weapons. | 15:50.38 |
| robin_watts_mac | male or female ? | 15:51.47 |
| henrys | male, we have warning signs here on the trails to beware they will charge and cause serious harm. | 15:52.36 |
| robin_watts_mac | I had an idea for an early agenda item. Miles wants us to walk shows once a year to try to flush out some sales leads. While doing that various people asked me for a business card. | 16:19.29 |
| | Is it worth us having business cards for such things? (Even having some of Scotts cards would probably be useful) | 16:20.06 |
| | I thought I'd mention it in advance of the meeting in case you/he think it's worthwhile. | 16:20.27 |
| henrys | oh I thought he did cards for everyone when they started... used to be that way. | 16:21.04 |
| robin_watts_mac | possibly, but I never got any, and I don't believe kens/chrisl have them. | 16:21.51 |
| henrys | so I'll add it to the agenda | 16:23.37 |
| robin_watts_mac | ta. | 16:26.42 |
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