Check the box for Stack Images and Seamless Tones and Colors. Optionally, select Content-Aware Fill Transparent Areas, which will fill any transparent areas generated by aligning images in step 3. (Be aware that this will increase processing time. Generally, I do not choose this option; rather, I just crop the image slightly later, if necessary.). Jun 30, 2020 Find stack stock images in HD and millions of other royalty-free stock photos, illustrations and vectors in the Shutterstock collection. Thousands of new, high-quality pictures added every day. Photo Stack displays photos around the outsides of a viewing area. When a new photo is navigated to, the current photo moves out of the viewing area and the next moves in. As many photos can be displayed as you like. The theme also shows a caption for each photo. Ideal for showcasing Instagram photos. Q&A for professional, enthusiast and amateur photographers. Stack Exchange network consists of 176 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.
[Also see the uxTaskGetStackHighWaterMark() API function]
Each task maintains its own stack. If a task is created using xTaskCreate() then the memory used as the task’s stack is allocated automatically from the FreeRTOS heap, and dimensioned by a parameter passed to the xTaskCreate() API function. If a task is created using xTaskCreateStatic() then the memory used as the task’s stack is pre-allocated by the application writer. Stack overflow is a very common cause of application instability. FreeRTOS therefore provides two optional mechanisms that can be used to assist in the detection and correction of just such an occurrence. The option used is configured using the configCHECK_FOR_STACK_OVERFLOW configuration constant.
Note that these options are only available on architectures where the memory map is not segmented. Also, some processors could generate a fault or exception in response to a stack corruption before the RTOS kernel overflow check can occur. The application must provide a stack overflow hook function if configCHECK_FOR_STACK_OVERFLOW is not set to 0. The hook function must be called vApplicationStackOverflowHook(), and have the prototype below:
The xTask and pcTaskName parameters pass to the hook function the handle and name of the offending task respectively. Note however, depending on the severity of the overflow, these parameters could themselves be corrupted, in which case the pxCurrentTCB variable can be inspected directly.
Stack overflow checking introduces a context switch overhead so its use is only recommended during the development or testing phases.
Stack Overflow Detection – Method 1
It is likely that the stack will reach its greatest (deepest) value after the RTOS kernel has swapped the task out of the Running state because this is when the stack will contain the task context. At this point the RTOS kernel can check that the processor stack pointer remains within the valid stack space. The stack overflow hook function is called if the stack pointer contain a value that is outside of the valid stack range.
This method is quick but not guaranteed to catch all stack overflows. Anytoiso 3 9 5. Set configCHECK_FOR_STACK_OVERFLOW to 1 to use this method.
Stack Overflow Detection – Method 2
When a task is first created its stack is filled with a known value. When swapping a task out of the Running state the RTOS kernel can check the last 16 bytes within the valid stack range to ensure that these known values have not been overwritten by the task or interrupt activity. The stack overflow hook function is called should any of these 16 bytes not remain at their initial value.
This method is less efficient than method one, but still fairly fast. It is very likely to catch stack overflows but is still not guaranteed to catch all overflows.
OM-D E-M1 Ver. 4.0
Utilising Focus Stacking and Focus Bracketing in Insect Photography with professional photographer, Kazuo Unno
Portrait basics entail shooting at the widest aperture value on a bright lens, while keeping the subject clear and sharp, and nicely defocusing the background. However, when shooting very small subjects such as insects, macro shooting is used and the depth of field becomes extremely shallow. For example, when using a 60mm macro lens and shooting at the closest focusing distance, focusing is only accurate within a range of 0.5 mm. You then stop down the aperture, but even doing so does not let you capture a photo that is in focus to the edges. Capturing a subject about 1cm in length from head to tail in perfect focus is a feat that all insect photographers wish to accomplish.
The forerunners in photography tried a number of different things, and came up with the most popular method: focus stacking. Focus stacking is a method where multiple photos are captured at slightly different focal positions, and then only the areas in focus are merged to form a single image. Because the smaller the subject the narrower the range of focus becomes, some subjects require a great amount of time and hundreds of photos. This method is very taxing, and not effective for living subjects such as insects.
By keeping the aperture set to f/8 or above I was able to obtain greater depth of field and challenge myself to capture a composite focus shot of a living insect with just a few shots. The Stylus TG-3 and TG-4 Tough cameras come equipped with a Focus Stacking Mode which automatically composites shots taken at different focal positions. This feature made these cameras indispensable tools for me, but I also wanted the even better image quality provided by a 60mm macro lens. Pcdj dex 3 6 1 1 download free.
What I ended up doing is use the TG-3 and TG-4 to shoot focus stacking images of small insects, and a 60mm macro lens to capture multiple images of large insects which I would later composite into a single photo. So many times I wondered how convenient it would be to have a camera capable of focus compositing that I could attach a 60mm macro lens to. I mean, it takes a minimum of 3 minutes to capture 100 focus shifted photos of a praying mantis. Because the mantis won't stay still for that long, it forces you to reduce the number of shots.
But now the OM-D E-M1 Ver. 4.0 Firmware Upgrade, with focus stacking and focus bracketing, has been released. I had the pleasure of testing the new firmware for about a month.Once I started using the new firmware, shooting was so much fun that I couldn't concentrate on my work for a month.
From the menu, turn Bracketing on, select Focus Bracketing Mode, and set the number of shots and focus steps. Focus steps are available from 1 to 10, and up to 999 shots can be set, which is quite impressive. A focus step refers to the amount of focus movement where 1 is the smallest setting. When shooting at the widest aperture value, I would recommend using focus step 1 or 2.
First I tried shooting a static specimen. I used focus bracketing to capture the face of a Malagasy jewel beetle at the studio. Shooting time was significantly reduced when compared with my traditional method. This is a very convenient function when you have to shoot a large number of specimen photos. However, unlike focus stacking, focus bracketing does not automatically composite images on the camera, so you need to use third-party software to do so.
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Standard Settings Focal length: 120mm (35mm equivalent), f/5.6
When using focus bracketing, the subject size and camera angle determines what settings will get good results. Although this is not always the case, when shooting near actual magnification with the focus step set to 1, it will take over 100 shots with a 60mm macro lens shooting at the widest aperture to capture a fully in-focus shot of an insect about 1 cm in length. Next, I tried shooting a live insect against a white background. Because live insects move, 100 shots are necessary, making it particularly difficult. When shooting a small insect of about 1 to 2 cm in length, focus step can be set to 2 or 3 if the insect isn't moving, and about 50 to 70 shots produce good results. An aperture setting of f/5.6 or f/8 is perfect.
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Standard Settings Focal length: 120mm (35mm equivalent), f/5.6 (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
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Focus Bracketing Focal length: 120mm (35mm equivalent), f/5.6, Focus step 2, 70 shots (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
Next, I attempted focus stacking shooting outdoors. I decided to capture a dragonfly, first. I tried the OM-D E-M1 Ver. 4.0's Focus Stacking Mode that automatically composites multiple images of different focus points. Dragonflies sitting on stones actually don't move much, so they make good subjects. I shot this with a 40-150mm f/2.8 zoom lens. A focus step setting of 3 seems to be good. Keeping the background defocused, the dragonfly stands out in the photo.
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Standard Settings Focal length: 420mm (35mm equivalent), f/6.3
I again changed to Focus Bracketing Mode, and used a macro lens and tripod to shoot a tree frog and a silver-studded blue in the thicket. Because you won't capture a good shot if the insect moves or the wind blows, a focus step setting of 4 is probably best. It is best to stop down the aperture as much as possible and capture less shots. An antlion larva, which often lives on a mossy rock, has amazing persistence, waiting patiently, without moving, for a chance to catch a meal. It is amazing how it actually covers its own back with moss to be completely camouflaged. Because this insect barely moves, focus bracketing is the right choice. When zooming in close on a larval insect smaller than 1 cm, because the surface of the rock is rough, you must use focus compositing to capture a shot that is completely in focus. With the camera stabilised on a tripod, and the aperture set to f/5.6, I took 50 shots each at focus steps 1 and 2. Although 50 shots were not enough on focus step 1, 50 shots on step 2 proved sufficient for a beautiful composite photo.
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Focus Bracketing Focal length: 120mm (35mm equivalent), f/8, Focus step 3, 14 shots (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
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Focus Bracketing Focal length: 120mm (35mm equivalent), f/8, Focus step 4, 18 shots (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
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Focus Bracketing Focal length: 120mm (35mm equivalent), f/4, Focus step 1, 60 shots (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
Focus stacking and focus bracketing are also useful for photos of plants. Shooting water droplets on leaves is also macro photography, so the settings are the same as for insects. Up to now, I never thought of shooting in any direction other than directly from above to capture a fully focused shot of leaves with dewdrops that stretch into the background. Because you can also shoot from an angle when using Focus Stacking Mode or Focus Bracketing Mode, you can capture the background reflected in the water droplets.
Photo Stack 3 8 100 Ft Air Hose
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Standard Settings Focal length: 120mm (35mm equivalent), f/5.6 (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
Focus Bracketing Focal length: 120mm (35mm equivalent), f/5.6, Focus step 6, 7 shots (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
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Focal length: 120mm (35mm equivalent), f/5.6, Focus step 4, 20 shots (M.ZUIKO DIGITAL ED 60mm F2.8 Macro)
Macro shooting is where Focus Stacking Mode and Focus Bracketing Mode really shine. However, I also discovered that these features can be used to capture images keeping both background and foreground in focus. Use OM-D E-M1 Ver. 4.0 with Focus Stacking Mode and Focus Bracketing Mode, choose a subject, and you may discover creative photos that you've never imagined before.
Stacker 3
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Standard Settings Focal length: 124mm (35mm equivalent), f/3.2 (M.ZUIKO DIGITAL ED 40-150MM F2.8 PRO)
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Focus Stacking Focal length: 124mm (35mm equivalent), f/3.2, Focus step 1 (M.ZUIKO DIGITAL ED 40-150MM F2.8 PRO)