Then, with the duplicate image open, select Image > Mode > Grayscale. This is a destructive conversion, so work on a copy of your color image by selecting Image > Duplicate… from the main menu. It then sums these modified values to obtain the final grey value. The grayscale conversion models this by multiplying the red value by 0.28, the green value by 0.7 and the blue value by 0.06. Our eyes are most sensitive to green, less sensitive to red and least sensitive to blue. This conversion models the way the human eye perceives the brightness in a scene. And although it’s quick and simple, it can give surprisingly good results. It’s not the best way to make a black-and-white image but it’s not the worst either. Switching to this mode necessarily removes the color from a photo. Images in this mode have no red, green or blue channels but instead store only the brightness (luminance) information in a single channel. It’s designed to handle images with no color information. Photoshop supports a special mode called ‘Grayscale’. Thus, the pixel is forced to a shade of grey. This calculates just one number that’s then applied to all color components. You enter the values from the red, green and blue components of each pixel into a formula. Whatever method you use, the process is essentially the same. Photoshop provides many different ways to convert a color image into a black-and-white one. I am pretty sure if the all the gammas are matched in settings and export processes you will not have any changes in color numbers.How to Edit Black and White Photos in Photoshop With the above information I think we can nail down how to achieve you desired results. That can be used to verify what grayspace is being used the GIMP image and how to proceed with PSģ) A screenshot of you Edit > Color Settings in Photoshop per the example from my system below: I gave a sample screenshot from GIMP that I just created:Ģ) Share the exact file in question exported from GIMP on a file sharing site. To nail this down the quickest here are the specific items that would really helpġ) Screen shot of the header in GIMP of the file name. There are three places that this could be involved I have not used GIMP for a long time yet downloaded the most recent version to help track down your issue. Thanks for that info and that is helpful. I may be missing something on how to do that in Photoshop if you would like to share how you do that. I have not seen 16bit grayscale representation in hex in the info panel or in the color checker. I noticed you are using hex format in 16 bit mode. Is preserving 16 bit data important to you? PNG and PBM does yet I am pretty sure BMP does not. Save for web I believe converts to 8 bit mode (at least it used to) Photoshop in 16 bit mode actually only supports 15 bits (it rounds the lower bit) - not sure if that is important to you or not Without the details of above, if you are staying in RGB or Grayscale, the easiest way to avoid a conversion is to uncheck the box that says convert to sRGB The receiving application may required a given color/gray space and may be doing a conversion on input. After saving the file, which application will be using the file. Are you saving/exporting also to RGB mode or converting to Grayscale mode and which RGB/Gray space are you converting too. Are you in Photoshops 16 bit mode (that would be my assumption yet double checking) What specific command are you using in Photoshop e.g Save As, Export, Save for Web and maybe a screen shot of the settings and/or preferences if using the Export command If RGB Adobe RGB, sRGB etc or if in Grayscale what Gamma or Dot Gain space are you using In which color space are you editing e.g. Are you editing in Grayscale mode or in RGB mode where R=G=B for each pixel Are you using Photoshop CC or some other program in which you are editing To be more specific, it would be helpful to know The key is either to avoid the conversion or making sure the conversion is done between spaces that have the same tone response curve. Hi very likely that there was a colorspace conversion (that includes grayscale conversions) where the tone response curve (also known as gamma) was different.
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