Photoshop changing bit depth?

If I click on Open image on a 16 bit image in Raw Photoshop opens as 16 bit. But if I open it from within photoshop or from Bridge, it opens as 8 bit (when it was a 16 bit TIFF image)

When encountering an issue with Raw 16 bit images in Bridge opening in Photoshop CS4 as 8 bit images, check the following:
Go to:
Adobe Bridge>Edit>Camera Raw Preferences
In the Camera Raw Preferences window, ensure that the first field, "Save image settings in:", is set to: "Camera Raw database".
Please note that selecting "Sidecar ".xmp" files" can result in 16 bit images selected in Bridge opening in Adobe Photoshop CS4 as an 8 bit image.

Similar Messages

Changing bit depth

Is there any way of changing bit depth in A3? I scan 48 and 16 bit TIFs and would like to drop certain pics to 24/8 (for storage reasons). I'd obviously prefer not to have to export to PS if possible. Thanks.

I don't know the technical trade-offs of _how_ the reduction in bit depth is done, but there must be a simple, probably automate-able and even batch-able way to effect the conversion. As an example, you could set Aperture "External Editor File Format" to "TIFF (8-bit)" and simply run "Edit with {external editor}", save the file in the external editor, and then back in Aperture delete your 16-bit originals.
The point -- which you've already understood -- is that you are creating new, different files and adding them to the list of files already listed in your Aperture Library. For your workflow, this makes sense and seems a good use of Aperture. You may find that the cost savings represented by the reduction in storage space achieved by lowering the bit-depth is not worth the administrative cost of creating these replacement files and deleting the others.

Changing bit depth/greyscale palette in Photoshop CS4

Hi,
I have Photoshop CS4 and I am trying to reduce a 256 greyscale palette to a 16 greyscale palette for a greyscale gif image.It is set at Indexed Color.
How do I do this?
I have tried to search for this information online, but I have had no success.
Thank you!

Hi,
Could you give me a step by step how to do that?
Do I go to Image -> Mode?
I cannot find the palette in Photoshop to change from 256 to 16.
I am a beginner in Photoshop, thank you!

PHOTOSHOP CS4 bit mode compatibility

I have files in RGB and their bit modes are deactivated so I can't add another RGB photo (in 8-bit mode) into that file nor can I deactivate the bit mode in the photo to match the main files. How to I make these two images compatible??? Please help!

Are you sure you are not in "Multichannel" mode?
That's the only way I can think of of not having the option to change bit depth.
Could you post a similar screen shot?
Even better, can you post a link to one of your affected files?
Wo Tai Lao Le
我太老了

PS-CC 2014 (latest) - changing 32-bit depth file to 16-bit

I opened a file, happened to be 32-bit depth (I don't have too many, not even sure how that one got to be 32-bit), and because a lot of filters don't work with that, I changed it to 16-bit, but when I did that, the HDR toning dialogue appeared, and I HAD to click OK on it to get the image to convert to 16-bit (CANCEL on the dialogue leaves it at 32-bit). So you have to choose a METHOD that you can set so there's no change to the image. Weird & wrong . . .

Sorry, no solution to the problem, but a confirmation. I do have the same problem (Intuos Pro and Pen & Touch) showing the problem with ACR 8.5 and Photoshop (2014, CC and 6, these were updated with ACR 8.5) . No such problem before ACR 8.5 and no problem with LR 5.5 (also containing ACR 8.5).
I hope there will be a solution from Adobe soon, since sems to be caused by the ACR update.
Windows 8.1 in my case and latest Wacom Intuos driver installed.
Thomas

16 bit depth photo restoration, older version of Photoshop.

I use an older version of Photoshop. It is able to import and read a 16 bit depth file. Though it is limited in what it can do with this bit depth, it can do the levels and curves adjustments on an image. I want to have the best quality scan to start with for photo restoration in my older Photoshop. I won't be able to directly import the file with my older Photoshop from the scanner. If I scan a photo as a 16 bit 600 ppi image, I'm afraid color information will be lost when I open it in the older Photoshop. Is there any way I can open and save such a file without losing all that good color information? I know I would need to save it in a format that supports 16 bit depth like png versus jpeg.

Not exactly sure how Image Capture works on lion, but i belive i read that since os x 10.5 that it should scan in 16 bits/channel
Are you able to use the software that came with the scanner instead of Image Capture or maybe you need to update your scanner software or
possibly check the preference in the Image Capture scanner preferences to use Twain Software When Possible.
Or scanner software like VueScan which is much better than most software that ships with scanners.
http://www.hamrick.com/
Anyway if the scan is saved as a 16 bits/channel tif as output by the scanner to a place (folder) on your hard drive, then ps7 should open it as such.

Photoshop CS4 - Converting bit depth on import

Photoshop seems to be converting pictures that I open to 8-bit from 24-bit: before the problem I think it was converting to 16-bit because Photoshop doesnt seem to support 24-bit but I cant remember.
I've been using Photoshop CS4 for about 4-5 weeks now without any problems and this just seems to have come out nowhere. The problem doesn't seem to be related to Camera Raw at all because I don't use it to import my pictures, so the "Workflow Options" don't seem to have any effect on the converting. I've also tried to delete the preferences file and that doesn't help either.
Any ideas?

Photoshop doesn't convert bit depths or color modes when opening documents, unless there is an unsupported bit depth (like 12 bits/channel) in which case we convert upward (to 16 bits/channel).
It would help if you told us what file format you were talking about, and what you mean by "24 bit".

Printing in Photoshop and Pages sets "change" bit in document

Is there any way to defeat the "change bit" being set in documents after printing? Even if I don't make any changes, EACH time I print (even the same print params), the change bit gets set in Photoshop CS3 and Apple Pages, and then I have to save the document again, or close the window and decline to save changes. VERY obnoxious. PRINTING does NOT change documents!
These apps Do NOT set the change bit on printing:
Eudora
AppleWorks
GraphicConverter
TextWrangler
MS Excel 11.1
MS Word 11.1
TextEdit
Xbench
Photoshop CS3 and (Apple) Pages DO exhibit this obnoxious behaviour after EVERY print, even if there are no changes or other actions (except Save) between printings. Every print causes the document to be changed for some reason. These are the ONLY apps which behave this way...
(These are all the apps that I ever print from...)

If the idea is to remember the printing setup in the doc itself, okay, maybe. But they should CHECK to see if the print setup is the same as before and NOT set the Change Bit.
They should also give you the option NOT to save the print setup in the doc itself.
Personally, I think all that should be done in Page Setup, the way it's been for more than 20 years. That is an explicit command to tell the doc what its print params should be. That's where this belongs, NOT in the Print command.
99.99% of people only have one printer, so Page Setup should do it all.

Can I change the bit depth on images in pdf files?

I have a lot of pdf files that were scanned in 24 bit colour. I'd like to convert some of them to greyscale or black and white, and reduce the resolution to make them smaller.
I can see how to reduce the resolution with Save As Other/Optimized PDF, but there are no options there to reduce bit depth. Is there any way to do this?

Thanks, I think I've worked out how to use them. I found a fixup called "Convert color to B/W", but it seems to convert to greyscale, not black and white.
I found this page describing how to convert to both greyscale and monochrome. It says the only way to do monochrome is to convert to tiff first:
http://blogs.adobe.com/acrolaw/2009/10/converting-color-pdf-to-greyscale-pdf-an-update/
If that's the case then Acrobat Pro isn't going to help me, but that was written in 2009. Does anyone know if true black and white conversion has been made available since then?

Filter plugin. Problem after change image depth.

Hi All !
I already wrote filter plugin it work fine but only for image depth 8bit, after i change image depth on 16 or 32 bits I getting error msg box from photoshop.
I try change on 'destination.colBits = 8' or 'destination.colBits = pChannel->depth' or ' (pChannel->bounds.bottom - pChannel->bounds.top) * pChannel->depth;' but all the same.
PixelMemoryDesc destination;
destination.data = data; //*pixel
destination.depth = pChannel->depth;
destination.rowBits = (pChannel->bounds.right - pChannel->bounds.left) * pChannel->depth;
destination.colBits = 8;
destination.bitOffset = 0 ;
Please help someone !
Very Thanks in Advance !
All code below:
// Gauss.cpp
// gauss
// Created by Dmitry Volkov on 30.12.14.
// Copyright (c) 2014 Automatic System Metering. All rights reserved.
#include "Gauss.h"
#include "GaussUI.h"
#include "FilterBigDocument.h"
#include <fstream>
using namespace std;
SPBasicSuite* sSPBasic = NULL;
FilterRecord* gFilterRecord = NULL;
PSChannelPortsSuite1* sPSChannelPortsSuite = NULL;
PSBufferSuite2* sPSBufferSuite64 = NULL;
int16* gResult = NULL;
void DoParameters ();
void DoPrepare ();
void DoStart ();
void DoFinish ();
void DoEffect();
void GaussianBlurEffect(ReadChannelDesc* pChannel, char* data);
void ReadLayerData(ReadChannelDesc* pChannel, char* pLayerData);
void WriteLayerData(ReadChannelDesc* pChannel, char* pLayerData);
DLLExport MACPASCAL void PluginMain(const int16 selector,
                                    FilterRecordPtr filterRecord,
                                    intptr_t * data,
                                    int16 * result)
    sSPBasic = filterRecord->sSPBasic;
    gFilterRecord = filterRecord;
    gResult = result;
    try {
            if (sSPBasic->AcquireSuite(kPSChannelPortsSuite,
                                               kPSChannelPortsSuiteVersion3,
                                               (const void **)&sPSChannelPortsSuite))
                *gResult = errPlugInHostInsufficient;
            if (sSPBasic->AcquireSuite( kPSBufferSuite,
                                               kPSBufferSuiteVersion2,
                                               (const void **)&sPSBufferSuite64))
                *gResult = errPlugInHostInsufficient;
            if (sPSChannelPortsSuite == NULL || sPSBufferSuite64 == NULL)
                *result = errPlugInHostInsufficient;
                return;
            switch (selector)
                case filterSelectorParameters:
                    DoParameters();
                    break;
                case filterSelectorPrepare:
                    DoPrepare();
                    break;
                case filterSelectorStart:
                    DoStart();
                    break;
                case filterSelectorFinish:
                    DoFinish();
                    break;
    catch (...)
        if (NULL != result)
            *result = -1;
void DoParameters ()
void DoPrepare ()
void DoStart ()
    if (*gResult == noErr)
        if (doUi())
            DoEffect();
void DoFinish ()
#define defColBits 8
void DoEffect()
    // Start with the first target composite channel
    ReadChannelDesc *pChannel = gFilterRecord->documentInfo->targetCompositeChannels;
    // Calculation width and height our filter window
    int32 width = pChannel->bounds.right - pChannel->bounds.left;
    int32 height = pChannel->bounds.bottom - pChannel->bounds.top;
    fstream logFile ("/Volumes/Macintosh Media/GaussLogFile.txt", ios::out);
    logFile << endl << "top " << pChannel->bounds.top;
    logFile << endl << "bottom " << pChannel->bounds.bottom;
    logFile << endl << "left " << pChannel->bounds.left;
    logFile << endl << "right " << pChannel->bounds.right;
    logFile << endl << "depth " << pChannel->depth;
    logFile << endl << "vRes " << gFilterRecord->documentInfo->vResolution;
    logFile << endl << "hRes " << gFilterRecord->documentInfo->hResolution;
    // Get a buffer to hold each channel as we process. Note we can using standart malloc(size_t) or operator new(size_t)
    // functions, but Adobe recommend sPSBufferSuite64->New() for memory allocation
    char *pLayerData = sPSBufferSuite64->New(NULL, width*height*pChannel->depth/8);
    if (pLayerData == NULL)
        return;
    // we may have a multichannel document
    if (pChannel == NULL)
        pChannel = gFilterRecord->documentInfo->alphaChannels;
    // Loop through each of the channels
    while (pChannel != NULL && *gResult == noErr)
        ReadLayerData(pChannel, pLayerData);
        GaussianBlurEffect(pChannel, pLayerData);
        WriteLayerData(pChannel, pLayerData);
        // off to the next channel
        pChannel = pChannel->next;
    pChannel = gFilterRecord->documentInfo->targetTransparency;
    // Delete pLayerData
    sPSBufferSuite64->Dispose((char**)&pLayerData);
void GaussianBlurEffect(ReadChannelDesc* pChannel, char *data)
    // Make sure Photoshop supports the Gaussian Blur operation
    Boolean supported;
    if (sPSChannelPortsSuite->SupportsOperation(PSChannelPortGaussianBlurFilter,
                                                &supported))
        return;
    if (!supported)
        return;
    // Set up a local rect for the size of our port
    VRect writeRect = pChannel->bounds;
    PIChannelPort inPort, outPort;
    // Photoshop will make us a new port and manage the memory for us
    if (sPSChannelPortsSuite->New(&inPort,
                                  &writeRect,
                                  pChannel->depth,
                                  true))
        return;
    if (sPSChannelPortsSuite->New(&outPort,
                                  &writeRect,
                                  pChannel->depth,
                                  true))
        return;
    // Set up a PixelMemoryDesc to tell how our channel data is layed out
    PixelMemoryDesc destination;
    destination.data = data; //*pixel
    destination.depth = pChannel->depth;
    destination.rowBits = (pChannel->bounds.right - pChannel->bounds.left) * pChannel->depth;
    destination.colBits = defColBits;
    destination.bitOffset = 0 ;
    // Write the current effect we have into this port
    if (sPSChannelPortsSuite->WritePixelsToBaseLevel(inPort,
                                                     &writeRect,
                                                     &destination))
        return;
    // Set up the paramaters for the Gaussian Blur
    PSGaussianBlurParameters gbp;
    int inRadius = 1;
    Fixed what = inRadius << 16;
    gbp.radius = what;
    gbp.padding = -1;
    sPSChannelPortsSuite->ApplyOperation(PSChannelPortGaussianBlurFilter,
                                                             inPort,
                                                             outPort,
                                                             NULL,
                                                             (void*)&gbp,
                                                             &writeRect);
    if (sPSChannelPortsSuite->ReadPixelsFromLevel(outPort,
                                                  0,
                                                  &writeRect,
                                                  &destination))
        return;
    // Delete the temp port in use
    sPSChannelPortsSuite->Dispose(&inPort);
    sPSChannelPortsSuite->Dispose(&outPort);
void ReadLayerData(ReadChannelDesc *pChannel, char *pLayerData)
    // Make sure there is something for me to read from
    Boolean canRead;
    if (pChannel == NULL)
        canRead = false;
    else if (pChannel->port == NULL)
        canRead = false;
    else if (sPSChannelPortsSuite->CanRead(pChannel->port, &canRead))
        // this function should not error, tell the host accordingly
        *gResult = errPlugInHostInsufficient;
        return;
    // if everything is still ok we will continue
    if (!canRead || pLayerData == NULL)
        return;
    // some local variables to play with
    VRect readRect = pChannel->bounds;
    PixelMemoryDesc destination;
    // set up the PixelMemoryDesc
    destination.data = pLayerData;
    destination.depth = pChannel->depth;
    destination.rowBits = pChannel->depth * (readRect.right - readRect.left);
    destination.colBits = defColBits;
    destination.bitOffset = 0 ;
    // Read this data into our buffer, you could check the read_rect to see if
    // you got everything you desired
    if (sPSChannelPortsSuite->ReadPixelsFromLevel(
                                                  pChannel->port,
                                                  0,
                                                  &readRect,
                                                  &destination))
        *gResult = errPlugInHostInsufficient;
        return;
void WriteLayerData(ReadChannelDesc *pChannel, char *pLayerData)
    Boolean canWrite = true;
    if (pChannel == NULL || pLayerData == NULL)
        canWrite = false;
    else if (pChannel->writePort == NULL)
        canWrite = false;
    else if (sPSChannelPortsSuite->CanWrite(pChannel->writePort, &canWrite))
        *gResult = errPlugInHostInsufficient;
        return;
    if (!canWrite)
        return;
    VRect writeRect = pChannel->bounds;
    PixelMemoryDesc destination;
    destination.data = pLayerData;
    destination.depth = pChannel->depth;
    destination.rowBits = pChannel->depth * (writeRect.right - writeRect.left); //HSIZE * pChannel->depth * gXFactor*2;
    destination.colBits = defColBits;
    destination.bitOffset = 0 ;
    if (sPSChannelPortsSuite->WritePixelsToBaseLevel(
                                                     pChannel->writePort,
                                                     &writeRect,
                                                     &destination))
        *gResult = errPlugInHostInsufficient;
        return;

Have you reviewed your code vs the Dissolve example? It is enabled for other bit depths as well.

How do I reduce the bit depth of images to 1-bit within Acrobat 9?

I am hoping a simple solution exists within Acrobat 9 for reducing the bit-depth of images to 1-bit.
I know of two methods that both seem more like workarounds. One, edit the image using Photoshop. Two, without Photoshop, export the page as a 1-bit PNG and recreate the page in Acrobat. It seems like one of the preflight fixups should be able to get it done with the right settings. But, it's a labyrinth of unfamiliarity.

There's no predefined 1-bit conversion in Preflight because it doesn't make sense. Preflight will not dither bitmaps, so most images will become black squares. Extreme color conversion is only intended for text/vector objects.
If you want to try it anyway, you can create a custom Fixup if you have a 1-bit ICC profile.
Preflight > Single Fixups
Options menu > Create new Preflight Fixup
Name it something like "Convert all to 1-bit BW"
Search for "Convert colors" in the type of fixup box and add it
Destination tab > Destination > your ICC profile for 1-bit black
Uncheck "use destination from Output Intent"
Keep everything else as default, though I'd suggest using "Embed as output intent for PDF/X" if you're making PDF/X documents
Conversion Settings tab > All Objects + Any Color (except spot) + Convert to destination + Use rendering intent
Press the + key to duplicate this step, and change the second copy to "Spot Color(s)"
Press + again and change the third copy to "Registration color"
Save the fixup and run it.
In case you don't have a 1-bit ICC profile installed, I've attached one.

Lion reduced the screen bit depth - any solution?

When I was on Snow Leopard I was painting in Photoshop in 16-bit mode on my 21" Wacom Cintiq.
It was a fantastic experience to finally have true control in settle changes in hues and shades all over the spectre.
Now that I've updated to Lion, the screen doesn't display true 16-bit graphics anymore, but instead there is pretty noticable banding. A sort of real-time downsampling in bit-depth going on. Even flickering on some grey hues.
I'm very sad about this, and it's affecting my work.
I have a hunch Lion is harder on old graphics cards than Snow Leopard was.
Is my machine too old for displaying true 16-bit/ 32-bit graphics with Lion?
In the system info under the graphics card it says: 32-bits color (ARGB8888), but it clearly isn't the case in terms of what is sent to the display.
MacBook Pro, late 2009, 8GB ram, 2,66 GHz Intel Core 2 Duo, Unibody
NVIDIA GeForce 9600M GT 256 MB
What I've tried so far (without solving the problem)
Closing Macbook screen to run only one display (Cintiq) (to save graphics memory, I thought) - no change.
Trieid displaying the same 16-bit image in different apps: Photoshop, Preview, Quicklook, Pages - no change
Forced monitor into "billions of colors" using SwitchResX - no real change
Anyone who knows more about this?
I will now try:
- finding Cintiq driver updates

I've tried to update the Cintiq driver, but in regards of bit depth, nothing changed.
My suspicion is that the graphics driver has to be updated/ optimized. And, judging from the overall performance dip my computer had after upgrading to Lion, it might be a big task, involving more than just the graphics driver. Perhaps the whole rendering engine?

Can't import a JPEG: "video bit depth of this file is unsupported"

Re above error message when attempting to import into a Premiere CS6 project. I used Media Info to inspect the file's properties as per below. All of the video in my project is 8bit video. Any help is much appreciated..
Image
Format                                     : JPEG
Width                                        : 1 306 pixels
Height                                       : 979 pixels
Color space                             : YUV
Bit depth                                   : 8 bits
Compression mode                : Lossy
Stream size                              : 2.83 MiB (100%)

Hi Jeff, thanks!!
I guess one cannot import cannot import a CMYK image in Premiere at all.
When I inspected the image in Media Info it ID'd it as a YUV and so I assumed that the imagwe was converted for use in a video that they'd created sometime in the past.
Is there even such a format as YUV for still images? Probably not even though Media Info ID'd it as such.
Anyway, Photoshop ID'd it as CMYK and when converted to RGB that did the trick!
Thanks!

Maximum Bit Depth /Maximum Render Quality Questions

Maximum Bit Depth
If my project contains high-bit-depth assets generated by high-definition camcorders, I was told to select Maximum Bit Depth because Adobe Premiere Pro uses all the color information in these assets when processing effects or generating preview files. I'm capturing HDV using the Matrox RTX-2 Hardware in Matrox AVI format.
When I finally export my project using Adobe Media Encoder CS4, will selecting Maximum Bit Depth provide better color resolution once I post to Blu-ray format?
Maximum Render Quality
I was told that by using Maximum Render Quality, I maintain sharp detail when scaling from large formats to smaller formats, or from high-definition to standard-definition formats as well as maximizes the quality of motion in rendered clips and sequences. It also renders moving assets more sharply. It's my understanding that at maximum quality, rendering takes more time, and uses more RAM than at the default normal quality. I'm running Vista 64 Bit with 8 GIGs of RAM so I'm hoping to take advantage of this feature.
Will this also help to improve better resolution when I finally export my project using Adobe Media Encoder CS4 and post to Blu-ray format?
Does it look like I have the specs to handle Maximum Bit Depth and Maximum Render Quality when creating a new HDV project with the support of the Matrox RTX 2 Hardware capturing in Matrox AVI format? See Below Specs.
System Specs
Case: Coolmaster-830
Op System: Vista Ultima 64 Bit
Edit Suite: Adobe Creative Suite 4 Production Premium Line Upgrade
Adobe Premiere Pro CS 4.0.1 update before installing RT.X2 Card and 4.0 tools
Performed updates on all Adobe Production Premium Products as of 03/01/2009
Matrox RTX2 4.0 Tools
Main Display: Dell 3007 30"
DVI Monitor: Dell 2408WFP 24"
MB: ASUS P5E3 Deluxe/WiFi-AP LGA 775 Intel X38
Display Card: SAPPHIRE Radeon HD 4870 512MB GDDR5 Toxic ver.
PS: Corsair|CMPSU-1000HX 1000W
CPU: INTEL Quad Core Q9650 3G
MEM: 2Gx4|Corsair TW3X4G1333C9DHXR DDR3 (8 Gigs Total)
1 Sys Drive: Seagate Barracuda 7200.11 500GB 7200 RPM 32MB
Cache SATA 3.0Gb/s
2 Raid 0: Seagate Barracuda 7200.11 500GB 7200 RPM 32MB Cache SATA 3.0Gb/s Using Intel's integrared Raid Controller on MB

Just some details that i find useful on maximum render depth
You really need it even with 8bit source files, when using heavy grading/multiple curves/vignettes. If after grading you see banding, go to sequence > sequence settings from the top menu and check "maximum bit depth (ignore the performance popup), then check again your preview (it will change in a second) to see if banding is still present in 32bit mode. If no banding, you must check it when exporting, if banding is still there, change your grading, then uncheck it to continue with editing.
Unfortunately Maximum bit depth exporting is extremely time-consuming, but can really SAVE YOUR DAY when facing artifacts after heavy grading, by completely or almost completely eliminating banding and other unwanted color distortions.
Use it only for either small previews or the really final output.
Best Regards.

Final cut pro millions of colours + bit depth question

Hello
I am working in final cut pro 7 and I wanted to know what is the maximum bit depth I can export using the Prores codec? All I see in compression settings for rendering my timeline when wanting to render with Prores 4444 is the option for 'millions of colors' and 'millions of colors +' I was under the impression that millions of colors refered to 8 bit... does the alpha channel mean I can get 10 bit? can the alpha channel hold 2 more bits per channel or something? Or is there no way I can export a 10bit file using the Prores codec within fcp7..? is it all just 8bit. -and when I select 422HQ there is no advanced options for millions of colors..what does this mean? is the only way to get 10bit out of fcp7 to render with the 10bit uncompressed codec? and if so can I render the timeline in prores while im working with it then delete all the renders and change the render codec to 10bit uncompressed, will this now be properly giving me 10bit from the original 4444 12 bit files i imported in the beginning..?
Any help is much appreciated

ProRes is 10-bit. Every ProRes codec is 10-bit...LT, 422, HQ. Not one of them is 8-bit. Except for ProRes 444...that's 12 bit.

Photoshop changing bit depth?

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