Photoshop - What is used of Channels in photoshop ?

Hi,
I want to know that about Channels in Photoshop.
1- its uses
2- function
Thanks
Susanta Kumar Muduli

Channels are greyscale images that create the image you see in Photoshop (Red, Blue and Green channels).
Additional channels ("Alpha channels") are greyscale images that store information for other uses (such as Masks and Selections)
Here is an Adobe Help article on Channel basics:
http://help.adobe.com/en_US/photoshop/cs/using/WS6EC2A68B-AE8D-4987-87E2-28272B744445a.htm l

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I'm having memory issues when using alias channel strips. What is happening is I create one instance of the plugin, say Massive. Then make a bunch of other alias on different patches. When looking at the memory usage everytime I add and alais it increases the memory usage by an amount the same as the origional plugin. ie. add 3 alias and you have 3 times more memory usage. See attached photos.
Original plugin instance ~80mb memory usage
Adding 3 Alias channel strips. ~330mb memory usage
By comparison here is the usage by adding 3 brand new instance of the plugins. ~160mb memory usage
By comparison it is using less memory by having 4 seperate instances of the plugin compared to using 3 alias's of the origional. This doesn't make sense since the whole point of an alias is to save memory by only loading one instance of the plugin.
Anyone have any thoughts?
Jon

What's interesting is that if I, starting with a blank concert, add a Massive to a patch and then make an alias the memory is as you say. But if I make a duplicate of the inital patch and then make alias's of that the memory is lower.
Are you seeing the same with the built-in plug-ins?

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I would like to use all channels on an AI-110 to sample the same signal in order to increase my sampling rate. (I have spare channels, not spare $$.) In hardware the channels are read sequentially so in theory I should be able to do this, but I'm having trouble reconstituting the signal. If I use FP Reads the timestamps seem to indicate the time of the read, not the time of the A/D conversion, so I can't tell which sample was taken last. FP-Advise on change seems ill-suited as well since consecutive samples may be the same on a certain channel, but the signal may have varied in the mean time on the other channels.
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Anton,
I understand what you are trying to do and do not think it can be done with a single module. The timestamp on the FP-Read is all about when the vi returned the data and not when the A/D conversion occured. I just don't think that the A/D converter can keep track of the conversion time.
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Aren't Sound Blasters what they used to

Hello everyone,
I have been a Creative Labs user for several years, especially before 2000 (Soundblaster 2.0, SB6 Vibra ISA (2x), SB Pro .0), and was absolutely pleased with them, especially with DOS games. Those were the happy times...
Anyway, in more recent times, after years of listening to trustworthy but not really performing AC'97 integrated soundcards, I decided to purchase an "audio accelerator" in the form of an Audigy 4 (the one with the EMU 0300 chip and no firewire/remote control, if that means anything).
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One day, out of the blue, while playing Battlefield 942 I got a horrible BSOD and had to reboot. After than, and after a VIA drivers update, I noticed that the sound stumbled and HARD DISK SAVING stumbled too, which was much more dangerous. I reverted to an older version of VIA drivers that didn't cause that problem, but one day I got another BSOD coupled with disk corruption, and, apparently, what later revealed to be a SATA CONTROLLER PHYSICAL DAMAGE!!!
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In any case, this card caused me a lot of expenses, and after reading the horror stories here, I am really afraid to plug it into any of my PCs, in fact I'll try to sell it hoping that the manufacturer's reputation doesn't make it impossible.
So really, what's the deal here? Is it just me, or Sound Blasters just aren't what they used to be? How can a whole class of hardware problems persist for so long, even trhough the X-Fi series? If I had seen those forums BEFORE handing out 70 Euros for that d4mn thing, I would have probably kept my money and stick to AC'97 with rock-solid drivers and hardware!Message Edited by CreativeSkeptic on 03-5-200704:20 PM

Well, I don't know how the X-Fi series scores in any of those fields, as I can only speak for my experiences with the Audigy 4.
Apart from the times where it obviously glitched and/or interacted badly with the rest of the hardware, it played quite smoothly, and MIDI playback took noticeably less CPU time than with the software synth (at least according to task manager, and obviously not accounting for PCI bus utilisation), which was one of the reasons I initially bought this card.
Exactly what makes MIDI playback different than playing sound effects in games? Since both are made from samples read from memory and sent to the sound card in different streams (up to 32 or 64 depending on your model), they should be exactly the same (well OK, midi is perhaps sort of more "continuous", but a game laden with sound effects may generate 0s of sound events per second).
By admitting that such "hardware accelerated" playback is beyond the capabilities of the current PCI bus is ridiculous, and obviously defeats the purpose of an accelerator sound card. Then why should one ever buy one, if in the end it's going to perform worse than software mixing and synthesis?
The numbers also don't convince me: the PCI bus has a 33 MHz clock speed and a 32-bit data bus, for a nominal data rate of 33 MB/sec. Even in ths case you're using 92 KHz, 24 bit resolution soundfonts for 64 channels at once, That means a "mere" 36.684 MB/sec at once. OK, using stereo soundfont would actually double that, and reach a whooping 73+ MB/sec, which is probably impractical.
For more "normal" game sound effects and soundfonts, admitting they use 48 KHz, 6 bit samples in stereo, that's a measly 2.28 MB/sec for using all 64 channels. Since virtually no midi really uses 64 channels, as don't most games, that leaves a margin of 0: compared to the PCI bus capabilities. To make a comparison, a TV tuner card I have, when capturing a PAL signal, produces something like a continuous stream of 33 MB/sec of raw data that can go on for hours, yet I never had any problems RECORDING that, with real-time MPEG compression (in software, it was a cheap TV tuner) while recording the sound with the integrated soundcard.
If the Audigy or the X-Fi or whatever cannot handle similar or inferior data rates, then something is basically flawed. Sure, there is still subdivision of the data stream into PCI packets, a maximum allowed bus mastering time and timing-sensitivity in the case of MIDI/sound effects, but still, glitchy playback and/or multi-second pausing indicates a much worse error than "missing" control of the PCI bus for a few cycles.
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Sent from Cisco Technical Support iPhone App

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Attachments:
channel_name.JPG ‏69 KB

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Hi all!
I am trying to control the AFG with LabView using the NI VISA driver. There are several given VIs I can use, but I don´t know how to use both channels at the same time correctly. I attached a VI I made.
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Attachments:
AWG_out_pulse_2ch.vi ‏36 KB

Hi Benjamin,
thanks for the replay. You helped me out very good! I had the Visa driver. I downloaded the driver in your link and it´s way better (more functionality) than the one I used. I now have a configuration, which is working. But there are two things I still doen´t know:
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hi,
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Type emp_table_type is table of
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here is one for you.
http://download.oracle.com/docs/cd/E11882_01/appdev.112/e17126/composites.htm#CHDEIDIC

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