Forum: Photoshop


Subject: CYMK and 300/600dpi

BellaDark opened this issue on Sep 13, 2000 ยท 5 posts


BellaDark posted Wed, 13 September 2000 at 12:20 PM

Okay, I read josiahpugh's message board on CYMK, and have learned some, but am still HUGELY confused... Three questions: 1) How do u put an image in CYMK mode, just choose it under the Image Mode CYMK menu?, 2) IT is better to have saved your image as a TIF instead of a JPG before opening it in Photoshop and using CYMK?, 3)How do you convert your image so that the resolution is 300dpi or 600dpi vs the 72dpi? Was reading the instructions for the calendar contest, and didn't even know you could do this.... I'm only a few months into using these programs, so am still trying to learn.... THanks for any help!!! Jessie, aka Picasso


dlm posted Wed, 13 September 2000 at 1:48 PM

Not sure if I fully understand what your after,but I,ll try to go through it in relation to the calender contest and asume thats what your after. 1)Yes thats all you need to do to convert from RGB to CMYK.If you go to the channels pallete you will see the channels change before and after you convert. 2)The reason that I mentioned saving in a tiff format during the earlier CMYK post was in relation to rendering images in Poser then bringing them into Photoshop for post production.The only advantage of rendering as a tiff is that when you bring it into Photoshop you will find that it has saved the file with four channels Red,Green,Blue and a channel called Alpha1.If you go to "load selection" and choose "Alpha1" from the drop down menu,you will find that your poser figure is perfectly selected so that you can remove it from the background for post production. 3)If you have poser4 and have installed one of the patches (ie 4.2)you can now render the image at any dpi you request (such as 300) up to the Poser maximum pixel size.However dpi is only relivant if you are measuring the final image in terms of print size only(ie 10"x8").If you are using pixel dimentions for the size of an image then 800 pixels by 600pixels is that size irrelivant of the dpi you choose.The dpi vrs print,pixel size really needs an answer on its own,if anyone wants to contribute.


BellaDark posted Wed, 13 September 2000 at 2:09 PM

Thanks, yes this does help!!! I was thinking of pixel demensions in terms of a finer looking image.... THat's how I understood the comments I'd read regarding the pixel size, that setting it as a 300 or 600 dpi would make the image look more defined when it printed off.... As for the image size, if you set the image at a size of 1024x768 (my desktop) but then adjust the dpi for the print quality, the image will stay at 1024x768? Sorry, but I am new at this, so I'm a bit paranoid I suppose..... As for the alpha1 thing, that's great! because I was trying to figure out a way to render the figure in Poser, but then remove it from the Poser background so I could place the figure against a Bryce background in Photoshop... I find that the skin tone, etc is much nicer and more realistic looking (at least in terms of my ability at this point) when I render the figure in Poser as opposed to Bryce. Thank you SO much!!! Jessie.


Spanfarkle posted Wed, 13 September 2000 at 3:11 PM

As far as the resolution goes, if you go into "image size" under your image pull down and then uncheck "resample image" the dpi and actual image dimensions will fluctuate around depending on which one you change. If you have an image 1024x768 at 72 dpi, do not have resample image checked and then change your dpi to 300 your image should come out to be about 3.4x2.5 in inches. You will keep the same number of pixels in your image if you do not resample. However if you go the other route and click resample image, have a set width, height and dpi, Photoshop will either reduce the number of pixels if you reduce or interpolate pixels if you enlarge, which can reduce image quality.


BellaDark posted Wed, 13 September 2000 at 4:19 PM

Thank you too, Spanfarkle!!!! :O)