8 and 16-bit grayscale alpha channel

Similar Questions

• keep an a 1 bit image alpha channel

  Greetings!

  I do a lot of pre-press and the restoration work for printing, mostly working with equipment that requires released as a 1 bit image - very fine line work and mechanical tones that will break or cause the moire if printed with dithering.

  For this reason, when you work with commercial printers I've out usually images with superior typical resolutions - 1 bit 2400 ppi files, i.e. the same their imagesetter resolution works.

  I have a request current a client that involves, at their request, to place images with transparency in Indesign rather than manipulate raster images in Photoshop and just out of the final 1 bit image and placing in Indesign.

  So, I was playing with alpha channels to try to find a solution to this. Is there any image format that will support two channels - one for a piece of mono ppi (1 bit) 2400 line drawings and the other for an alpha channel that will be used to hit transparent sections in Indesign after the fact? Is this possible?

  I COULD simply threshold - adjust my image to make pseudo-1-bit and then place the file in Indesign. But it's a big waste of space (the file resulting in dozens of times larger) AND it makes it more likely that someone will accidentally mixed the image during the RIP to print, thus defeating the objective of providing a high resolution 1-bit image in the first place.

  Please, please, anyone out there have any advice for me?

  Best,

  
  Sean

  Well, the next day-

  I read some more about how little coding works on different file formats. There is no place for the information/alpha channel for transparency on image 1 bit because, well, there is only a single bit, i.e. two States - on (ink) or disable (paper). If the shutdown state is managed like a white by Indesign, or the stop State is managed as paper and is presented in a transparent manner.

  So what I really need, is a 2-bit image format. A PNG. While there are four States - on (ink), (off-white) and another way for transparency.

  So I have 'threshold' converted by alpha channel and my channel of the image, then to export--> save for Web (inheritance) and selected 4 color PNG. Voila! Perfect bitmap 1-bit with transparency.

  Now, if he is a pretty good solution for my printer and their Raster image processor, we get to see!

• Create alpha channels that are premultiplied with png and other formats

  Hello

  I am in the process of manufacturing assets for Unity3D engine and I do the transparent PNG with alpha channels that are premultiplied with black. My questions:

  1. To this day I use superPNG plugin to add an alpha channel, because it was really hard to find the opportunity to do this in the menu Save under... . Today very very accidentally, I found Export-> video renderer where I choose PNG and premultiplication. I do something wrong or is this the right way to Photoshop to export png via the video function? It seems really hidden!
  2. I can do the same thing for TIFF, PICT (I guess no pict for me because its pure mac?) and tga with a layer of black format and checking box of Alpha channels, but its somehow greyed out for PNG? Why is this?

  I think its a kind of contradiction, or am I missing something?

  Thank you for your time,

  Peter

  PNG, standard format, does not support alpha channels, only a single transparency channel.

  PNG allows only 4 channels, and that the fourth channel is transparency.

  Some video software packages use PNG and treat as premultiplied, even though the spec file says that it must be of the right color.

  You could save yourself a lot of trouble by jumping alpha channels simply recording your PNG after step 1.

  Yes, if you messed with the color values and alpha channel you might have ended up with a file that looks like values premultiplied (since you wrote all the zeros in the layer of color, but has no need of).

• How to open 32-bit PNG alpha unpremultiplied?

  I have the last Photoshop CC (2014) and I tried to figure out how to import a PNG file of 32-bit with alpha channel embedded, but unpremultiplied in it.  So this is a PNG image with four channels: red, green, blue and Alpha.  Unfortunately, when I open it in PS, I get a picture of three channels (R, G, B) where PS has premultiplied cheerfully alpha in other channels, as you can see here:

  

  The "glow" is adverse to the Alpha channel.

  I know that the Alpha channel is still there because if choose channel-> Split, I get four grayscale images: myimage_red, myimage_green, myimage_blue and myimage_transparency.    So the Alpha information is kept separate, but PS is 'useful' and he premultiplying outdoors.

  Y at - it a setting or anything else that can solve this problem?

  Note: The reason is that I use the 'alpha' for something else (ambient occlusion) channel in a CG program and it must not be used for transparency at this stage.   (Long story).

  Yes, you are badly abusing the word "premultiplied".

  There is no premultiplication past here - just says that you have something in the transparency channel which is not transparent and therefore doesn't seem correct when applied as transparent as a PNG, it must be.

  Read my previous post about how to extract the transparency channel.

  In addition, you must talk to your authors to program CG PNG export to actually conform to the PNG specification.

• Manual exposure with alpha channel

  I have 3 shows a photo in Photoshop. I would like to manually mix the layers using an alpha channel (identify areas of exhibition as a channel of luminosity) and a layer mask. Firstly I have Ctrl-Click the RGB channel to make a selection for the first exhibition. I then create an alpha channel of this selection. After that I press ctrl-d to cancel the selection. I then select the layer I just create a channel with and then I alt-click on create a mask at the bottom that connects a black mask to this layer. Following that I will come back and ctrl + click the alpha channel or just load the selection, and then use the Brush tool (which I have reset several times) with a white foreground and black background, I paint in the underlying layer, however it does not work. Previously I could only paint in the layer that was selected by the alpha channel, but now the brush just exposes all the parts of the image even outside the selection. I noticed that if I manually magic wand parts of the picture and try to paint in the layer, it works, but using the alpha channel selection is not.  The Brush tool will not be forced to alpha channel selection, when it is trying to reveal the underlying layer with a mask of black layer applied.

  Your selection is not pure & white black (completely hidden, or completely unmasked based on the limits of the mobile dots you see on the screen). If you save your selection as a channel by selecting select > Save selection..., you will see the alpha is composed of gray tones, which means that you can see the brush strokes (although slightly paler) appear outside the moving dotted line.

• Alpha channel renders in preview, but not in the exported file.

  I have a pronounced After effects with Animation codec quicktime video that has an alpha channel.  Looks great play on the timeline in the first cc2014, but when exporting the layer alpha is made black.  I did exactly the same thing several times in previous versions of first without problem.  Is this a known issue with the first?  Is there another way to do that properly renders Media Encoder?

  It is a remake of an old video from SD card HD.  So, all this has been done before with success.  Why does cc_2014 not make it properly?

  Thank you.

  Problem solved.  I closed the first and Media Encoder and then reopened them and they made the alpha channel properly.

• Change an alpha channel

  Once I have create an alpha channel, how to edit it?  I tried by selecting and clicking on the alpha channel and then using the Brush tool.  I understand that if I have a white foreground, painting should take away part of the mask, while a black background should translate into paint, adding to the mask.  But often, nothing seems to happen when I paint.  Or, at other times, the painting translates to paint on my image but don't marks not affect "mobile dash" and therefore does not affect the mask. I already checked that my color K setting is 0 for white and 100 for blacks.  With the help of the CS5 13.0 x 64 with Windows 7 version.

  My apologies for the newbie question.  I must be missing something very obvious.  I googled this and haven't found anything useful.  (Maybe I'm looking at the wrong words.)

  

  One thing I see is that you have made your selection of active sky channels, so you won't really the active selection when you paint on the channels.

  Selections (ants in market) are not changed in this way.

  Try to select > deselect and then paint on the channels.

  Then you can Ctrl (Cmd) click on the channel thumbnail in the Panel layers for a walk new selection of ants that reflects your painting of the channel.

  (or click the load channel as selection at the bottom of the Panel channels)

• Quicktime MOV alpha channel

  Hi all.

  I made on a 3D logo in 3D for a quicktime movie program and had put my background on the rendered file to be a transparent alpha channel. Once I import MOV 3D logo in first elements, add to my calendar, choose picture, choose alpha set I expect there will be a selection to use the alpha channel so that background goes out to reveal the clip below.

  Nope. He did give me a slider to set the alpha that disappears the entire clip and the 3D logo fades as well. I don't understand!

  In first pro demo all I had to do was put the 3D MOV in the timeline, check that I wanted to use the clips alpha and bingo! The background is off to reveal the clip below. Simple.

  Where is this setting in the elements? Support with built in alpha channels quicktime movies?

  Chroma keying is not an option because the 3D logo has many shades of colors.

  Any who found the option for this or know of a workaround?

  If your program's output and MOV with true alpha channel, you will not have to key to all of this.

  The transparent areas will all be simply transparent. I do it all the time with the video of After Effects.

• Convert a sweep of 16-bit grayscale tif to DNG and getting 48-bit RGB?

  I have scanned hundreds of old black and white negative using Vuescan to TIFF 16-bit grayscale. If I open in Photoshop CC2014 the tab indicates that they are a single 16-bit grayscale channel. But if I have Lightroom convert them into DNG and then open them in Photoshop, they appear as 48 bit RGB or three 16-bit RGB channels. The three channels are identical. What happens here? Is it only returned as a 48-bit RGB or the DNG image byPhotoshop to store the RGB image? The DNG format is not much bigger than the TIF, so it doesn't seem to be store 48 - bits of information. I lose all the data on your way to the DNG format with a scanning in grayscale?

  Given that I can export the DNGs to a tif and it refers to a single channel 16-bit, I suppose I don't lose all the information, but I'd rather not use DNG for scans in grayscale? Or should I edit in Photoshop with the three RGB channels on and understand that I am change the grayscale channel should ever export back to tiff?

  It seems at least that there is a gap in the rendering of the shades of gray DNG in Photoshop?

  I think that the best way to answer here is to explain my own workflow.

  I have to be a little brief: it's getting very late, and I start tomorrow a roadtrip of six weeks.

  I do a lot of work with TIFF scanned, and it never occurred to me to convert to DNG.

  I start with rough tonal corrections, noise reduction and retouching in PS and then import the image (with all the shadow and highlight details present) in LR.

  Here, I'm very good tuning and capture sharpening, but sometimes the image must return to the PS for editing. I use then change the Original and the image opens grayscale in PS. After check-in PS, I click on the exclamation mark on the thumbnail and choose import disk settings and updates to images in LR.

  Given that I find the release of LR sharpening unsuitable for scanned images (it's probably optimized for digital capture), I export a new LR tiff image, open it in PS, conversion of RGB to grayscale and use Smart Sharpen for output sharpening. I wish you that LR could export in grayscale, but I've learned to live with it. You could easily implement an action of conversion in levels of gray (and 8 bits) and use it regularly.

  My knowledge of the technical aspects of the dng files is limited, but my impression is that they are files in grayscale, which explains the small size of the file.

  The color is added in the process of deconvolution in LR.

  I do not think that your workflow with convertin to DNG will affect the quality, so stick with it if you wish.

  I gladly carry on this discussion, but since I'll be on the road, you answer could take some time.

• How do you get the 32-bit floating-point effects of working with an alpha channel?

  I do a few bugs, and lower thirds, but I find it very difficult to obtain effects of 32-bit floating point for export with transparency properly.

  When I do translucent animations with brilliant light effects, they look great in AE but I can't seem to find a way to bring Final Cut and get them to look as they should.

  I have attached this example of a bug with a screenshot of EI on the left with the CPF on the right. The Sun of colors and gradients of vibrant blue get flattened in a dull greenish color.

  

  As far as I know, all my alpha and color management settings are correct. I tried the options endless and codec settings to try to solve this problem, nothing helps.

  You can create an extreme, as for example by creating a translucent shape, crank the path of color to a saturated color superwhite and moving it around with the motion blur. The rendering looks pretty good to make an 8/16-bit, and nothing like he did in your Web.

  I have the feeling that superwhite with alpha channel color values are multiplied by the way AE gets ' lost in translation ' when it is rendered 4-channel 8-bit. Is it possible to look the way it does in the Web?

  Thank you

  Clint

  There is nothing wrong with AE, you have just a poor understanding of the works of floating point processing. In short: you're confusing mix of transparency, and this is why everything falls apart when you export. The color is still there, there is simply no opaque pixels to process on and so she never shows upward, much less in an environment that only works in 8 and 16 bits as FCP, limited killing already loyalty by using an 8-bit format. That's all that happens, and unfortunately there really isn't much you can do. Unmultiplying the result based on luminance should give you a usable result, but it remains an approximation, and regardless of whether you use the same blend modes in FCP, it will never be the same work. So in conclusion, a better way to do this would be to work 8 or 16bpc and make it look as if she were 32bpc. That is, if you can't make the final stage in AE, where even once, you'd be able to get a good mix in the float.

  Mylenium

• How to use a black and white AVI as an alpha channel?

  Brand new first CC 2015 user here (actually just a user first brand new total), with what is probably a very simple question:

  How can I take a clip in black and white and get the Premiere Pro to use as a mask in alpha channel?

  Basically, I got three items I want to composite together, each of them their own separate AVI:

  (1) a coin of spinning

  (2) a silhouette of the spinning coin

  (3) a movement background

  The animations of the rotation of the piece were made by Bryce 7.1, if this can help, a program that does not know how to incorporate animations alpha channel masks.  I call the "silhouette" as such because it is a completely white room version, turning on a totally black background - perfect for use as an alpha channel, but without the alpha channel information incorporated.  And no matter what I do, I'm not the first to recognize it as such.  Any help would be appreciated.

  Put the background on the V1.

  Thread the room spinning V2, directly above him.

  Put the Silhouette of the coin spinning on V3, just above (and in sync with) V2.

  Go to the control panel effects and go to Video Effects > Keying and select the overlay Cache Track effect. Drag it to and apply it to the room turns on V2.

  A once applied, click the clip on V2 to select and go in the effect controls panel.

  Click the triangle next to the overlay track matte value using Composite matte Luma and the Matte of Video 3. Check the box opposite if necessary to invert the matte.

  

  MtD

• Bad Alpha channels and different levels of opacity in CS6

  I try to use a low 3rd stock animated and noticed that if I put it on any video clip, the alpha channel has not been completely transparent, but if I put it right on the timeline by itself, it went well.  It is very sensitive at the beginning and end of the clip, because it comes out making it unusable.  It looks the same when I go out.  I use H.264 with HD 720 p 29.97 preset

  On a video clip of Black...

  http://i.imgur.com/crcUSDd.jpg

  No video...

  http://i.imgur.com/GxkE7OS.jpg

  On what I assume is a tied note, opacities in my titles look the same on the timeline as they do when I'm changing them.  Really noticeable with the sample black on black below...

  On the timeline...

  http://i.imgur.com/0spagbL.jpg

  In the Titler.

  http://i.imgur.com/wYmEtUI.jpg

  It renders as it appears on the timeline, which is in fact them incorrect. 90% should be much darker than that.

  In addition, it does when I use SD (avi, mov and mpg2 similar) images on a HD timeline.  When previewing, it does only when in pause, but it makes this way unless I have crops...

  http://i.imgur.com/UTl14F7.jpg

  This cannot be normal.  I have a pretty basic setup, so it must be a setting somewhere...

  System specs...

  HP Z400 workstation

  -Windows 7 (updated)

  -24 GB OF RAM

  -Intel Xeon W3680 6-Core

  -EVGA nVidia GeForce GTX 680

  Adobe CS6 version 6.0.3

  Matrox MX02 w/MAX

  You probably need more information, I am pleased to provide you with all the settings or other information needed to diagnose this problem.

  Thank you very much.

  Scott

  Clear the CUDA acceleration.

• Problem with cs6 and alpha channel AND updates...

  I converted just of CS5 at CS6.  Files that work in CS5 are no longer works.  CS6 seems to skip a lot of alpha channels.

  I tried to re - import a film - image (ignore alpha offshore) interpretation and update to Cs6.01, but the update will fail with Error Code: U44M1I200.

  This is an iMac i7 3.4, 12 GB of RAM, OSx10.7.4

  I need to solve two problems.
  

  Vince
  

  Two problems.  Uninstall - re - install.  Very stupid.

  V

• Action to combine separate images and alpha channels

  I have a sequence of images 200 + each with a separate file, corresponding alpha channel which should be recombined in photoshop. Ideally, I would like to load each image as a layer and the corresponding alpha image as a mask to this layer, and then save the entire file as a .tiff.

  The files are in the order IE results)

  Image_1

  Image_1_alpha

  Image_2

  Image_2_alpha

  Image_3

  Image_3_alpha

  ...

  I am familiar with the actions and batch processing, but something of this magnitude is beyond me. I think there should be some kind of custom script or action. Ideas and help is appreciated!

  So I sort of found a work around that is not as intuitive, but works using measures.

  Basically, I opened a pair of side-by-side images in PS it is)

  Image_1

  Image_1_alpha

  and performed an action where I copied the image alpha basically and pasted as a mask for color image. I then added a record and double closure order to close both files.

  If I open all my files-by-side in sequence and perform the action that I can treat all my files but need to manually run the action rather than use a drop or a lot.

• mac NBA preview and/or finder icon normal when the file has alpha channels

  When I save a file, the psd or tiff in photoshop cs5, the icon from the finder or the preview icon shows only a mask, and occ displays no icon. the file itself always seems very well.

  Use imac, i7, 10.6.8 but it happened with prev snow leopard, as well.

  only today I realized that this behavior is always associated with at least an alpha channel in the file.

  I trashed PS prefs several times and once, finder preferences to no avail. I know it's weird and probably irrelevant, but I fear that this may indicate a scandal delayed.

  Thanks for any help.

  Vince

  Yes, it is a known bug in parsing code (as well as many others) from the files of Apple.

  Apple has not bypassed to fix it again (but they fixed some of those related to 10.6).