The best way is to use Gimp’s Perspective tool in Corrective mode. Now it’s much easier to use the perspective tool in „Corrective (Backward)“ mode. By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy. An example is editing using text as the transparency mask. It doesn’t matter what you choose as the mask, since we’ll be replacing it shortly. As part of its international business, the Bank supports clients with German connectivity and companies operating in selected future-oriented industries.
How can I convert an image to 16bit high color in gimp?
But as said, the effect is difficult to see in complex images. There exists also 15 bit versions where also green has 32 steps and the 16th bit in the 2 bytes per a pixel system is used to transparency or some other information. In the common high color system the 16th bit is given to green, because the eye is said to be most sensitive to see the striping for green gradients. The image turns to quite yellow due the reduction of blue. Here it’s done for blue (sorry for using Krita, but it’s the same in all common image editors) RGB displays did show quite the same range of colors as today.
Gimp – Using an image as the transparency layer of another image
- You can quantize a normal srgb image which has 256 steps for each channel.
- (also available by right-clicking the layer in the Layers dialog).
- If you check the file properties, it should show as a 16bit image.
- I suppose after doing this, you could open it up again in GIMP then export as an RGB PNG, but the PNG format doesn’t support this actual bit depth.
Complex images can well look acceptable, no matter blue and red has only 32 brightness steps and green has 64. Try color selecting the stroke with the Magic Wand (adjust the tolerance at the top to refine the selection) then using any of the other selection tools like the Rectangle Marquee tool for example, hold shift and select the area within. With the grayscale image layer visible, open the Channels dialog, right-click one of the Red/Green/Blue channels (they should all be identical) and select Channel to Selection.
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- How do I create a free form selection around the document in GIMP, and crop it to a perfect rectangle, gradually compacting/stretching the content so that the document looks perfect?
- So, after selecting the border itself with the magic wand as you did above, click on the small „hidden“ button to the left of the horizontal scroll bar.
- The problem was that the small amount of memory in computers and slow calculations force low cost systems use quite sparse set of samples of the color range of the display.
- The guide assumes the alpha channel is to be found as a component of another image.
- Here it’s done for blue (sorry for using Krita, but it’s the same in all common image editors)
- For „layer mask“ basics, have a look at this tutorial.
Also see How can I select the convex hull of an existing selection? On selecting the red line we will end up with an outer and an inner selection of the area enclosed. Holding Alt subtracts from the current selection. In the Selection menu, I can invert the selection, but that grabs everything.
I’ve tried selecting the entire border using the fuzzy select (magic wand) or select by color but this only gives me the border itself. How do I create a free form selection around the document in GIMP, and crop it to a perfect rectangle, gradually compacting/stretching the content so that the document looks perfect? I found a way that in my opinion is better in certain situations where you may want to edit both the transparency layer and the image. @IlmariKaronen answer is correct but assumes a little bit of gimp knowledge, so I am writing a step by step guide here, so it’s easier to follow for people with zero gimp knowledge.
(also available by right-clicking the layer in the Layers dialog). I have two images (For the sake of simplicity, Image1 and Image2). Also for animation on the web better to export as GIF. Say a portrait is in color, and you duplicate it but in black-and-white. There’s a bit more banding in gradients perhaps.
High color was a step to better colors in the era when color was a new thing in low cost computers. I have gimp installed, but am also open to using web tools or even command line tools. Eventually it was not possible to tell in the selection editor if i was adding anything or not. As a result, I could select much of the outline by Shift clicking with the select by Color, on different pixels of the outline… I had an outline in an image which i wanted to select, followed by the entire interior as described in this question.
Steps By Step:
For „layer mask“ basics, have a look at this tutorial. On the base image layer and choose „Selection“ from the dialog. Invert the selection with Select → Invert or Ctrl+I.
Steps By Step:
(Base image based on this photo by John Fielding, used under the CC-By-SA 2.0 license; alpha mask created by me using the GIMP’s Sphere Designer tool.) When you export to GIF, the image is automatically color indexed but there are no options. How to create an animation as .png using Gimp that cycles between the two images by gradually morphing them together in a loop back-and-forth? Little different from a normal 8bit per channel RGB (24bit) image to be honest. You can quantize a normal srgb image which has 256 steps for each channel.
I haven’t tried this for high color coded files, but now and then I meet a CMYK jpg which looks like it has wrong colors when watched in program which knows only RGB. Finally we can successfully use a wrong display method for image files which use different than normal color coding. The result surely looks oversaturated if the limited palette uses only saturated colors. Above the diagonal the colors are quantized to high color levels with curves as shown above. The colors are unedited below the white diagonal.
Optionally, turn the layer mask into an actual alpha channel using Layer → Mask → Apply Layer Mask (but simply exporting the image as PNG will do that for you). Then, just use the bucket-fill tool to fill u the outside (or inside) of your selection with „White“ (Which will render the trnaslucent tint transparent), revert back to normal editing by clicking on the quickmask again – and you are done. Add an alpha channel for it with Layers → Transparency → Add Alpha Channel if it doesn’t have one already, and then cut the selection away from the layer (Select → Cut or Ctrl+X). Also, saved the initial image to 16-bit high-color BMP (R5G6B5), and comparison shows the re-loaded BMP and the channel-quantized image are identical (histogram of difference is all 0’s). The most common obscurity is that the term brings up color images which have very saturated colors.
I allows you to paint on the selection itself as if it were the image – The guide assumes the alpha channel is to be found as a component of another image. The layer mask you just added should be selected for editing; if not, select it with Layer → Mask → Edit Layer Mask (or just click the mask in the Layers dialog). Now run the Morph (interactive) filter in G’MIC, make sure to set it to „all layers“, hit OK, and then close two little preview Windows that open. Here’s another example made with the same filter, this one just has four layers to start with, the first is colour, second B&W, third B&W, and the fourth colour.
I’d like to select the border AND the inner contents so I can produce something like this (sloppily done here with the Lasso) I have the the outline of a state with a discrete colorful border. There is also a similar Unified Transform tool (Shift+T) in GIMP (which is free). You put the 4 corner handles of the tool on the 4 corners of what should be a rectangle, and let it work its magic.
Just that thing justifies the idea of the high color. The problem was that the small amount of memory in computers and slow calculations force low cost systems use quite sparse set of samples of the color range of the display. Here’s a simple way to let the fuzzy select drive the entire process. So, daman game online after selecting the border itself with the magic wand as you did above, click on the small „hidden“ button to the left of the horizontal scroll bar. How can I select all the contents inside a selected region?
In 16 bit high color system (2 bytes per pixel) Red and Blue had 32 brightness steps. I don’t actually need the image to export as a 16bit/px image format, but I do want to see what it would look like. I would like to convert an image in to 16bit high-color. In order for it to work, I first had to add some Fuzzy Selection of contiguous regions by color, inside the outline selection. Holding Shift (while dragging a selection) with a selection tool adds the new selection to the current selection. You can utilize multiple selection tools for a single selection.