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tensorflow / tensorboard

TensorFlow's Visualization Toolkit
Apache License 2.0
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Can tensorboard adjust the display window in IMAGE tab? #680

Closed mp-czhang closed 6 years ago

mp-czhang commented 7 years ago

I was wondering if I can adjust the greyscale of the image shown in the IMAGE tab of tensorboard for better visualization. Say adjust the window from greyscale [0 1] to [0.3 0.7]... If there's not such a feature, is it possible to be added?

wchargin commented 6 years ago

Hi. It sounds like you're saying that you want to be able to apply a color map to your images while viewing them on the image dashboard. Is this correct?

The dashboard doesn't currently support this; we emit the images exactly as you output them from the image summaries. This is theoretically possible; we could apply filter: constrast(x) to images, where x is controlled by a slider.

chihuahua commented 6 years ago

What does adjusting from greyscale [0 1] to [0.3 0.7] mean? For instance, given original pixel values

200 100 42

would my new pixel values be

156.5 116.5 93.3

? I just mapped from a scale of [0, 255] to [255 * 0.3, 255 * 0.7].

Also, what is the use case for this feature? If it's useful enough, we (or an open-source contributor) can add the feature. And per @wchargin, it seems like we can probably use CSS filters.

mp-czhang commented 6 years ago

@chihuahua @wchargin Thanks for addressing this issue. As for @chihuahua 's concern, the pixel value remains unchanged. Adjusting the widow scale allows different contrast of images for better visualization. This might be important for medical imaging applications for instance, where image details do matter a lot.

nfelt commented 6 years ago

Assigning to @zcz004 just for tracking purposes, since the PR is in review.